Dmitri Mendeleev: The Master of Elements, Scientific Rivalries, Scandalous Bigamy & A Lasting Legacy - CelebPedia
Chemist, Physicist, University Professor, Scientific Inventor
Fact-Checked & Verified 🕊️ Deceased (Aged 72) CelebPedia Verified Index

Dmitri Mendeleev: Major Philosophical Works, Influence & Enduring Stature

Dmitri Mendeleev remains one of history’s most iconic scientific figures, famed worldwide as the visionary architect of the Periodic Table of Elements. Born in the remote wilds of Tobolsk, Siberia, in 1834, Mendeleev overcame immense personal tragedy, poverty, and institutional rejection to revolutionize physical chemistry. Beyond his genius in predicting undiscovered elements with astonishing precision, Mendeleev lived a turbulent life marked by public controversy, including a high-profile bigamy scandal that defied the Russian Orthodox Church and Tsar Alexander II himself. From his explosive academic disputes with European rivals to his pioneering work in petroleum, metrology, and ballooning, Mendeleev’s path was defined by unyielding determination, fierce independence, and a colorful personal life that captivated 19th-century Europe.

Born – Died
1834 – 1907 (Aged 72)
Occupation / Primary Role
Chemist, Physicist, University Professor, Scientific Inventor
Zodiac Sign
Aquarius
Nationality / Birthplace
Russian
By Dr. Julian Chen ()
16 min read
Published:
Updated:

CelebPedia Fast Facts: Dmitri Ivanovich Mendeleev

CelebPedia Fast Facts: Dmitri Ivanovich Mendeleev
Full Legal Name: Dmitri Ivanovich Mendeleev
Stage / Known As: Dmitri Mendeleev
Date of Birth: 08/02/1834
Date of Passing: 02/02/1907 (Aged 72)
Zodiac Sign: Aquarius
Place of Birth: Tobolsk, Tobolsk Governorate, Russian Empire
Resting Place: Saint Petersburg, Russian Empire
Nationality / Origin: Russian
Height / Stats: 5 ft 10 in / 178 cm
Education: Main Pedagogical Institute, Saint Petersburg; Heidelberg University
Occupation: Chemist, Physicist, University Professor, Scientific Inventor
Spouse / Partner: Feozva Nikitichna Leshcheva (m. 1862, div. 1881), Anna Ivanovna Popov (m. 1882)
Children: 7 (Maria, Volodymyr, Olga, Lyubov, Ivan, Vassili, Polina)
Official Profiles: Wikipedia

Work, look for peace and calm in work: you will find it nowhere else.

— Dmitri Ivanovich Mendeleev

From the Tobolsk Glassworks to Saint Petersburg: Dmitri Ivanovich Mendeleev’s Siberian Youth

Dmitri Ivanovich Mendeleev was born on February 8, 1834, in the remote Siberian town of Tobolsk, Russia. He was the youngest of a large and resilient family, believed to be the seventeenth child born to Ivan Pavlovich Mendeleev, a respected director of the local gymnasium, and Maria Dmitrievna Mendeleeva (née Kornilieva). The Korniliev family were notable pioneers in Siberia, having established the region’s first glass manufacturing factory and publishing house. However, tragedy struck the household early in Dmitri’s life. Shortly after his birth, his father suffered severe visual impairment due to cataracts and lost his teaching position, plunging the family into financial instability.

To support her extensive household, Maria Mendeleeva took over the management of her family’s abandoned glass factory in Aremzyanskoe. Growing up around the roaring furnaces of the glassworks, young Dmitri developed a deep fascination with chemical reactions, mineral heat properties, and industrial manufacturing. His early education at the Tobolsk Gymnasium was marked by an intense curiosity for natural sciences and mathematics, though he often rebelled against traditional classical rote learning, particularly Latin and Greek grammar. His home environment was further enriched by intellectual discussions, as Tobolsk was a primary exile location for Decembrist political dissidents. These intellectuals frequently visited the Mendeleev home, fostering in young Dmitri a questioning mindset, a fierce work ethic, and a lifelong skepticism of rigid dogma.

Disaster struck again in 1848 when the glass factory burned to the ground in a catastrophic fire. Refusing to allow her youngest son’s scientific potential to be squandered, Maria Mendeleeva packed up their remaining belongings and embarked on an extraordinary journey across the Russian Empire. Riding on horseback and carriage over thousands of miles, she traveled to Moscow in 1849 hoping to secure Dmitri’s admission to Moscow University. Rebuffed by University officials due to bureaucratic regional restrictions, Maria refused to yield and pressed onward to Saint Petersburg. In 1850, through the assistance of her late husband’s former colleagues, she successfully enrolled Dmitri into his father’s alma mater, the Main Pedagogical Institute.

Tragically, within weeks of securing Dmitri’s university placement, his devoted mother succumbed to tuberculosis. Shortly thereafter, his elder sister Elizabeth also passed away. Orphaned and isolated in the imperial capital at just sixteen years old, Mendeleev dedicated himself entirely to his studies as a tribute to his mother’s monumental sacrifice. Despite suffering from severe lung ailments that frequently confined him to bed, he excelled academically, graduating at the top of his class in 1855 and receiving the prestigious gold medal for academic excellence in physical sciences.

Dmitry Mendeleev: The teachings of a prophet | The UNESCO Courier
Dmitry Mendeleev: The teachings of a prophet | The UNESCO Courier

Academic Breakthroughs at Heidelberg Labs: How Dmitri Ivanovich Mendeleev Mastered Physical Sciences

Following his graduation, Mendeleev’s health deteriorated rapidly, with doctors suspecting terminal tuberculosis. Seeking a warmer climate, he relocated to the Crimean peninsula, securing a teaching position at the Simferopol Gymnasium in 1855. When the Crimean War disrupted academic life, he transferred to the Lyceum in Odesa. In the coastal climate, his health miraculously improved. By 1856, Mendeleev returned to Saint Petersburg with renewed vigor, successfully defending his master’s thesis on the specific volumes of chemical compounds, which demonstrated the relationship between chemical composition and physical properties.

Recognizing his exceptional talent, the University of Saint Petersburg awarded Mendeleev a government fellowship in 1859 to pursue advanced post-doctoral research in Western Europe. He selected Heidelberg University in Germany, then a flourishing epicenter of chemical research. Rather than joining the crowded university laboratory of Gustav Kirchhoff and Robert Bunsen, Mendeleev established his own private laboratory in his apartment. Equipping it with custom-blown glassware and precise instruments, he conducted groundbreaking investigations into capillary action, liquid surface tension, and absolute boiling points (a concept precursor to critical temperature).

A major turning point in Mendeleev’s career occurred in September 1860, when he attended the International Chemical Congress in Karlsruhe, Germany. This historic gathering, organized by leading European scientists, sought to resolve widespread confusion surrounding atomic weights, chemical notation, and nomenclature. The passionate presentations of Italian chemist Stanislao Cannizzaro, who advocated for Amedeo Avogadro’s unified system of atomic weights, profoundly influenced Mendeleev. Armed with standardized atomic weights, Mendeleev realized that the fundamental building blocks of matter possessed an underlying structural order that science had yet to decode.

Returning to Saint Petersburg in 1861, Mendeleev assumed the professorship of chemistry at the Saint Petersburg Technological Institute and later at Saint Petersburg State University. Finding a severe lack of comprehensive textbooks written in the Russian language, he authored the groundbreaking work Organic Chemistry in just 60 days. The textbook was hailed as a masterpiece of scientific literature, earning him the prestigious Demidov Prize from the Imperial Academy of Sciences and establishing him as the premier chemical authority in the Russian Empire at the age of twenty-seven.

Formulating the Periodic Table of Elements: Dmitri Ivanovich Mendeleev’s 1869 Chemical Codex

Predicting Unknown Elements: Dmitri Ivanovich Mendeleev’s Eka-Silicon and Atomic Weight Proofs

In 1868, Mendeleev began working on his definitive textbook, Principles of Chemistry (Osnovy Khimii), a multi-volume work that would become an international standard translated into English, German, and French. While attempting to structure the chemical elements according to their atomic weights and chemical properties, he encountered a massive conceptual puzzle. Chemists had discovered 63 elements by 1869, but no universally accepted system existed to organize them coherently. Existing attempts, such as John Newlands’ “Law of Octaves” or Alexandre-Émile Béguyer de Chancourtois’ telluric helix, had been dismissed by the international community as incomplete or numerical coincidences.

Mendeleev tackled the problem with characteristic intensity. He created a custom deck of cards, writing the name, atomic weight, and physical properties of each of the 63 known elements on individual cards. For weeks, he played a solitary game of scientific solitaire, endlessly arranging and rearranging the cards on his desk, searching for repeating patterns. On March 1, 1869 (February 17 in the Julian calendar), after an uninterrupted 3-day work marathon, Mendeleev fell asleep at his desk. Legend holds that he experienced a vivid dream in which all the elements fell perfectly into a grid based on ascending atomic weight and periodic chemical valency.

Upon waking, Mendeleev drafted his historic paper, “The Relation between the Properties of the Elements and their Atomic Weights.” He presented his discovery to the Russian Chemical Society on March 6, 1869 (delivered by his colleague Nikolai Menshutkin due to Mendeleev’s illness). Mendeleev’s periodic arrangement revealed that when elements are arranged in order of increasing atomic weight, their chemical and physical properties recur at regular periodic intervals. This fundamental insight became known as the Periodic Law.

Dmitri Mendeleev | Biography, Periodic Table, & Facts | Britannica
Dmitri Mendeleev | Biography, Periodic Table, & Facts | Britannica

Validating the Periodic Law: Dmitri Ivanovich Mendeleev and the Discovery of Gallium

What elevated Mendeleev’s Periodic Table from a convenient classification scheme to a monumental scientific triumph was his audacity to leave blank spaces within his grid. Mendeleev realized that gaps in his table did not represent flaws in his system, but rather elements that existed in nature but had not yet been discovered by human science. Using his Periodic Law, he went a step further: he predicted the exact atomic weights, physical densities, chemical valencies, and isolation methods for three undiscovered elements, naming them provisionally eka-aluminum, eka-boron, and eka-silicon (using the Sanskrit prefix eka, meaning ‘one’).

The global scientific community initially met Mendeleev’s bold assertions with skepticism. However, disbelief turned to awe over the next decade as experimental chemists discovered these missing elements one by one:

  • Gallium (Eka-Aluminum): Discovered in 1875 by French chemist Paul-Émile Lecoq de Boisbaudran. Its atomic weight, specific gravity, and chemical reactions matched Mendeleev’s 1869 predictions almost identically.
  • Scandium (Eka-Boron): Discovered in 1879 by Swedish chemist Lars Fredrik Nilson, confirming Mendeleev’s predicted physical properties.
  • Germanium (Eka-Silicon): Discovered in 1886 by German chemist Clemens Winkler. Germanium’s density, atomic mass, and oxide formation perfectly validated Mendeleev’s detailed forecast.

The discovery of Germanium sent shockwaves through the scientific world. Mendeleev was elevated from an esteemed Russian professor to a towering international icon of science. His periodic table was rapidly adopted in universities across Europe and the Americas, providing the unifying framework that transformed chemistry from a chaotic collection of empirical observations into an exact, predictive science.

Dmitri Mendeleev - thought and work giant. The 180th anniversary | Igor Sikorsky Kyiv Polytechnic Institute
Dmitri Mendeleev – thought and work giant. The 180th anniversary | Igor Sikorsky Kyiv Polytechnic Institute

Authoring The Principles of Chemistry: Dmitri Ivanovich Mendeleev’s Definitive Science Textbooks

Beyond his theoretical work in chemistry, Mendeleev was a visionary polymath whose contributions transformed multiple industries. In the 1870s, the Russian Imperial Government commissioned Mendeleev to investigate the fledgling petroleum industry in Baku (modern-day Azerbaijan). Recognizing oil’s immense economic potential, he rejected the traditional view of petroleum as simple lamp fuel, famously declaring that “burning petroleum as fuel is akin to stoking a kitchen stove with banknotes.” He pioneered advanced petroleum refining techniques, introduced continuous distillation methods, and correctly predicted that oil would become the primary feedstock for global petrochemical industries.

Mendeleev also made major contributions to meteorology, aeronautics, and hydrodynamics. In August 1887, at the age of 53, he conducted a daring high-altitude solo balloon flight in a hot-air balloon named Russ to observe a total solar eclipse above Klun, Russia. Ascending over 11,000 feet into the atmosphere without prior pilot training, he successfully observed the solar corona and safely navigated the balloon through a storm landing miles away, earning him widespread popular acclaim and an award from the French Academy of Aerostation.

In 1892, Mendeleev was appointed Director of the Imperial Bureau of Weights and Measures in Saint Petersburg. Over the next decade, he completely modernized Russia’s measurement infrastructure, standardizing national units of mass, length, and volume, and introducing strict quality controls for commercial manufacturing. His scientific stature earned him the world’s most elite academic honors, including the Copley Medal from the Royal Society of London (1892), the Davy Medal (1882), and honorary doctorates from Oxford, Cambridge, and Edinburgh universities.

Life Beyond the Laboratory: Dmitri Ivanovich Mendeleev’s Household in Imperial Russia

Dmitri Mendeleev’s personal life was as tumultuous, colorful, and intense as his academic career. In 1862, under strong pressure from his elder sister Olga, who feared his relentless work schedule was destroying his health, Mendeleev married Feozva Nikitichna Leshcheva. Feozva was six years his senior and the stepdaughter of the famous Russian poet Pyotr Yershov. The marriage was fundamentally mismatched from the start. While Feozva preferred traditional social gatherings and quiet domestic routine, Mendeleev lived an eccentric, workaholic lifestyle, frequently locking himself in his laboratory for days, smoking heavy tobacco, and displaying an explosive temper when interrupted.

Despite having two children together, Volodymyr and Olga, the couple grew distant and spent years living in emotional separation. By the mid-1870s, Mendeleev was living virtually alone in his university quarters. In 1876, at the age of 42, Mendeleev met Anna Ivanovna Popov, an artistic 16-year-old music student who had come to Saint Petersburg from Cossack country to study at the Academy of Arts. Mendeleev fell passionately in love with Anna, experiencing an intense mid-life romantic obsession that transformed his public and private life.

The father of the periodic table | Feature | Chemistry World
The father of the periodic table | Feature | Chemistry World

When Anna’s family, alarmed by the dramatic age gap and Mendeleev’s married status, sent her away to Rome to break off the relationship, Mendeleev threatened self-harm and pursued her to Italy in 1881. Overwhelmed by his persistent courtship, Anna agreed to marry him. Mendeleev immediately demanded a divorce from Feozva, offering her his entire university salary as a settlement. The divorce was finalized in late 1881, but under Russian Orthodox Canon Law, a divorced individual was required to wait seven years before entering into a new marriage. Mendeleev refused to wait.

In early 1882, Mendeleev found a renegade Orthodox priest in Saint Petersburg who agreed to perform the marriage ceremony between him and Anna in exchange for a large bribe of 10,000 rubles. The illicit wedding triggered a massive public scandal across imperial society, placing the country’s premier scientist in direct violation of both civil and ecclesiastical laws. Mendeleev and Anna went on to enjoy a loving, deeply creative partnership that lasted until his death. They had four children together: Lyubov, Ivan, and twins Vassili and Polina. Their home became a famous cultural salon in Saint Petersburg, drawing prominent artists, writers, and scientists, including painter Ilya Repin and poet Alexander Blok, who eventually married Mendeleev’s daughter Lyubov.

Institutional Feuds: Dmitri Ivanovich Mendeleev’s Battles with Imperial Academies

The Anna Popova Bigamy Scandal: Tsar Alexander III Defends Dmitri Ivanovich Mendeleev

Mendeleev’s illegal second marriage in 1882 ignited a legal and social firestorm that reached the highest levels of the Imperial Russian Court. Under Russian Imperial law, entering a second marriage before the expiration of the seven-year penance period constituted the felony of bigamy. Conservative religious leaders and senior university officials demanded that Mendeleev be arrested, stripped of his academic chairs, and exiled from the capital. The priest who conducted the illegal wedding was promptly defrocked and banished from Saint Petersburg.

However, Mendeleev’s towering international reputation made him virtually untouchable. When a high-ranking nobleman complained to Tsar Alexander II about Mendeleev’s flagrant violation of church law and asked why the scientist was not being punished like any ordinary citizen, the Tsar famously replied: “Mendeleev admittedly has two wives, but I have only one Mendeleev.”

While Tsar Alexander II shielded Mendeleev from criminal prosecution, the scandal exacted a heavy social and professional toll. Conservative factions within the Imperial Academy of Sciences used the moral outrage to sabotage Mendeleev’s candidacy. When his name was put forward for full election to the Academy in late 1880 and 1882, the conservative bloc voted to reject him, electing lesser-known foreign-trained candidates instead. The rejection caused a massive public outrage among Russian university students and progressive intellectuals, who held street demonstrations supporting Mendeleev and condemning the Academy’s reactionary bias.

The 1906 Nobel Prize Controversy: Svante Arrhenius Opposes Dmitri Ivanovich Mendeleev

Mendeleev’s career was defined by fierce intellectual feuds. He maintained a long-standing, bitter dispute with French chemist Paul-Émile Lecoq de Boisbaudran over the discovery of Gallium. When Lecoq published his initial physical measurements of Gallium, Mendeleev wrote a scathing public letter claiming Lecoq’s measurements were inaccurate because they did not match his theoretical predictions for Eka-Aluminum. Horrified that a theorist who had never seen the element was correcting his laboratory work, Lecoq re-purified the metal and conceded that Mendeleev’s theoretical calculations were indeed more accurate than his own initial experiments.

Mendeleev also engaged in high-profile clashes with Western European scientists over priority credit for the Periodic Table. German chemist Lothar Meyer had published a similar periodic classification shortly after Mendeleev in 1870. While Meyer had independently recognized periodic trends in physical atomic volumes, Mendeleev aggressively defended his unique claim to total priority, pointing out that Meyer had failed to predict new undiscovered elements or correct erroneous atomic weights as he had done. The debate raged in scientific journals for decades before the Royal Society recognized both scientists with joint honors, though history ultimately crowned Mendeleev as the primary discoverer.

Twas the Night Before the Periodic Table - Berkeley Lab – Berkeley Lab News Center
Twas the Night Before the Periodic Table – Berkeley Lab – Berkeley Lab News Center

In 1890, Mendeleev’s career at Saint Petersburg State University came to a sudden, dramatic end. During a period of intense student unrest demanding academic freedoms, Mendeleev agreed to deliver a student petition directly to the Imperial Minister of Education. The Minister harshly rebuked Mendeleev and ordered him to stay out of student politics. Outraged by the government’s disrespect, Mendeleev immediately resigned his professorship after thirty years of distinguished service, walking away from university teaching forever.

The ultimate injustice of Mendeleev’s scientific career occurred at the end of his life regarding the Nobel Prize in Chemistry. In 1905 and 1906, the Nobel Committee for Chemistry nominated Mendeleev for the Nobel Prize, recognizing the Periodic Law as one of the greatest achievements in human history. In 1906, the Chemistry Committee voted unanimously to award him the prize. However, Svante Arrhenius, an influential Swedish chemist and Nobel laureate who held a bitter personal grudge against Mendeleev due to Mendeleev’s outspoken criticism of Arrhenius’s ionic dissociation theory, intervened. Arrhenius used his executive position on the Royal Swedish Academy of Sciences to overturn the committee’s decision, arguing that the discovery was “too old” to qualify. Mendeleev died in February 1907 without receiving the Nobel Prize, a decision now universally acknowledged as one of the greatest oversights in Nobel history.

Standardizing Russian Petroleum and Bureau of Weights: Dmitri Ivanovich Mendeleev’s Industrial Feats

In 19th-century European high society, Dmitri Mendeleev was a striking, unmistakable figure. He possessed an eccentric aesthetic that defied all victorian conventions: wild, shoulder-length white hair, an unkempt beard, and piercing blue eyes. He famously refused to trim his hair or beard more than once a year, even when summoned to private audiences with Tsar Alexander III, declaring that his appearance was secondary to his work. He dressed in simple, durable woolen suits, often resembling a Siberian peasant or artisan rather than an elite academician.

Mendeleev was a passionate craftsman away from the laboratory. His primary lifelong hobby was bookbinding and custom luggage crafting. He meticulously built leather suitcases, travel boxes, and document portfolios by hand, buying materials in Saint Petersburg markets where merchants knew him simply as “Mendeleev, the famous suitcase master,” completely unaware of his scientific global fame. When asked why he spent hours gluing leather and cardboard, he replied that manual crafting provided mental rest and absolute precision.

Mendeleev’s cultural footprint extends deep into modern pop culture, education, and digital media:

  • Chemical Element 101 (Mendelevium): In 1955, American physicists led by Glenn T. Seaborg synthesized a new radioactive transuranium element and named it Mendelevium (symbol Md, atomic number 101), securing his name permanently on the very table he created.
  • Lunar & Planetary Honors: A massive impact crater on the far side of the Moon (Crater Mendeleev) and the asteroid 2769 Mendeleev bear his name.
  • The Vodka Myth: A persistent popular urban legend claims that Mendeleev invented standard 40% Russian vodka. While Mendeleev did write his doctoral dissertation “On the Combinations of Water and Alcohol” (1865), his work focused on molecular volume contraction rather than spirit production. However, Russian spirits marketing heavily leveraged his name to promote quality standards.
  • Digital Legacy: Today, Mendeleev is a popular cultural icon across science communication platforms, Google Doodles, and interactive educational software, symbolizing the triumph of intuition, rigorous data mapping, and stubborn determination.

Element 101 Mendelevium: The Enduring Global Legacy of Dmitri Ivanovich Mendeleev

Though Dmitri Mendeleev passed away from influenza on February 2, 1907, at the age of 72, his scientific legacy continues to evolve in 21st-century science. His burial at the Volkovskoye Cemetery in Saint Petersburg was attended by tens of thousands of university students, scientists, and citizens, who marched carrying a massive banner displaying the Periodic Table of Elements above his coffin.

Today, the Periodic Table remains a living, evolving framework. Modern nuclear chemistry institutes, such as the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Berkeley National Laboratory in the United States, continue to synthesize superheavy elements (such as Oganesson and Tennessine), extending the grid that Mendeleev laid down over 150 years ago. The United Nations declared 2019 as the International Year of the Periodic Table of Chemical Elements, celebrating the 150th anniversary of Mendeleev’s 1869 paper and reaffirming his status as the foundational architect of modern chemical science.

Dmitri Ivanovich Mendeleev FAQs: Key Questions Answered

How old was Dmitri Mendeleev when he died?

Dmitri Mendeleev was 72 years old when he passed away on February 2, 1907, in Saint Petersburg, Russia, following complications from influenza.

Who was Dmitri Mendeleev married to?

Mendeleev was married twice. His first marriage was to Feozva Nikitichna Leshcheva (1862–1881). His second marriage was to artist Anna Ivanovna Popov (1882–1907), which caused a major public bigamy controversy in Russia.

What is Dmitri Mendeleev’s most famous work?

His most famous work is the creation of the Periodic Law and the Periodic Table of Elements in 1869, which organized known chemical elements and accurately predicted the existence and properties of undiscovered elements.

Did Dmitri Mendeleev win a Nobel Prize?

No, Mendeleev was famously snubbed for the Nobel Prize in Chemistry in 1906 due to internal committee politics and a personal feud with Swedish chemist Svante Arrhenius, despite unanimous initial support from the committee.

Portrait of Dmitri Mendeleev (1834-1907) - Science History Institute Digital Collections
Portrait of Dmitri Mendeleev (1834-1907) – Science History Institute Digital Collections
Dmitri Mendeleev (1834-1907), received his doctorate in chemistry in 1865 in St Petersburg, and began teaching inorganic chemistry there. He found there was no suitable textbook; he had already written a successful
Dmitri Mendeleev (1834-1907), received his doctorate in chemistry in 1865 in St Petersburg, and began teaching inorganic chemistry there. He found there was no suitable textbook; he had already written a successful
AI Citation

Ask AI & Cite This Biography

Ground your AI research with verified CelebPedia facts

Query this profile directly across leading AI search engines with verified citation grounding, or copy the formatted academic citation:

Primary Sources & Editorial References

View Verification Standards →

This biographical profile has been verified across multi-tier primary and archival sources under CelebPedia's 5-Stage Fact-Checking Protocol. Key evidentiary documentation includes:

  • Biographical Archive & Timeline: Wikipedia (English Public Record)
  • Entity Disambiguation & Identifiers: Wikidata Knowledge Base & International Standard Name Identifier (ISNI)
  • Financial & Career Valuations: SEC Corporate Filings, Bloomberg Billionaires Index, Forbes Wealth Trackers & Official Industry Trade Records
  • Filmography, Discography & Performance Stats: IMDb Pro Archives, Recording Industry Guilds & Official Sanctioning Bodies