Notable Deaths on January 6

Gregor Johann Mendel was an Austrian biologist, meteorologist, mathematician, Augustinian friar and abbot of St. Thomas' Abbey in Brno (Brünn), Margraviate of Moravia. Mendel was born in a German-speaking family in the Silesian part of the Austrian Empire and gained posthumous recognition as the founder of the modern science of genetics. Though farmers had known for millennia that crossbreeding of animals and plants could favor certain desirable traits, Mendel's pea plant experiments conducted between 1856 and 1863 established many of the rules of heredity, now referred to as the laws of Mendelian inheritance.

Mehmed IV, nicknamed as Mehmed the Hunter, was the sultan of the Ottoman Empire from 1648 to 1687. He came to the throne at the age of six after his father was overthrown in a coup. Mehmed went on to become the second-longest-reigning sultan in Ottoman history after Suleiman the Magnificent. While the initial and final years of his reign were characterized by military defeat and political instability, during his middle years he oversaw the revival of the empire's fortunes associated with the Köprülü era. Mehmed IV was known by contemporaries as a particularly pious ruler, and was referred to as gazi, or "holy warrior" for his role in the many conquests carried out during his long reign.

Georg Ferdinand Ludwig Philipp Cantor was a mathematician who played a pivotal role in the creation of set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers. Cantor's method of proof of this theorem implies the existence of an infinity of infinities. He defined the cardinal and ordinal numbers and their arithmetic. Cantor's work is of great philosophical interest, a fact of which he was well aware.

Frances Burney, also known as Fanny Burney and later Madame d'Arblay, was an English novelist, diarist and playwright. In 1786–1790 she held the post of "Keeper of the Robes" to Charlotte of Mecklenburg-Strelitz, George III's queen. In 1793, aged 41, she married a French exile, General Alexandre d'Arblay. After a long writing career that gained her a reputation as one of England's foremost literary authors, and after wartime travels that stranded her in France for over a decade, she settled in Bath, England, where she died on 6 January 1840. The first of her four novels, Evelina (1778), was the most successful and remains her most highly regarded, followed by Cecilia (1782). She also wrote a number of plays. She wrote a memoir of her father (1832), and is perhaps best remembered as the author of letters and journals that have been gradually published since 1842, whose influence has overshadowed the reputation of her fiction, establishing her posthumously as a diarist more than as a novelist or playwright.

Archibald Joseph Cronin (Cronogue) (19 July 1896 – 6 January 1981) was a Scottish physician and novelist. His best-known novel is The Citadel (1937), about a Scottish physician who serves in a Welsh mining village, and then moves into a highly paid private practice in London where he becomes disillusioned with the greed and incompetence of some doctors. In writing the book, Cronin utilized his experiences both as a medical inspector of mines, and a physician on Harley Street. The Citadel exposed unfairness in British medicine and helped inspire the National Health Service.

Vladimir Ivanovich Vernadsky, known in Ukraine as Volodymyr Ivanovych Vernadsky, was a Russian, Ukrainian, and Soviet mineralogist and geochemist who is considered one of the founders of geochemistry, biogeochemistry, and radiogeology. He was one of the founders and the first president of the Ukrainian Academy of Sciences. Vladimir Vernadsky is most noted for his 1926 book The Biosphere in which he inadvertently worked to popularize Eduard Suess's 1875 term biosphere, by hypothesizing that life is the geological force that shapes the earth. In 1943 he was awarded the Stalin Prize. Vernadsky's portrait is depicted on the Ukrainian ₴1,000 hryvnia banknote.

Chikamatsu Monzaemon , real name Sugimori Nobumori , was a Japanese dramatist of jōruri, the form of puppet theater that later came to be known as bunraku, and the live-actor drama, kabuki. The Encyclopædia Britannica has written that he is "widely regarded as the greatest Japanese dramatist." His most famous plays deal with double-suicides of honor-bound lovers. Of his puppet plays, around 70 are jidaimono (時代物), and 24 are sewamono (世話物). The domestic plays are today considered the core of his artistic achievement, particularly works such as The Courier for Hell (1711) and The Love Suicides at Amijima (1721). His histories are viewed less positively, though The Battles of Coxinga (1715) remains praised.

Silvana Pampanini was an Italian film actress, director and singer. She was also the niece of the soprano of the golden era of opera, Dame Rosetta Pampanini. Silvana Pampanini caused a sensation when she took part in the 1946 Miss Italia contest and the following year she started her movie career. Madame Pampanini was born into a well-off family, she was educated, and studied opera and ballet since her childhood. According to interviews, Pampanini was a contralto with notable voice extension. However, she also said many times over the years that she preferred to pursue a career in cinema as it required less training and it was much less demanding than a career as an opera singer.

Baldassare Tommaso Peruzzi was an Italian architect and painter, born in a small town near Siena and died in Rome. He worked for many years with Bramante, Raphael, and later Sangallo during the erection of the new St. Peter's. He returned to his native Siena after the Sack of Rome (1527) where he was employed as architect to the Republic. For the Sienese he built new fortifications for the city and designed a remarkable dam on the Bruna River near Giuncarico. He seems to have moved back to Rome permanently by 1535. He died there the following year and was buried in the Rotunda of the Pantheon, near Raphael.

Alvin Christian "Al" Kraenzlein was an American track-and-field athlete known as "the father of the modern hurdling technique". He was the first sportsman in the history of the Olympic games to win four individual gold medals in a single discipline at the 1900 Summer Olympics in Paris. As of 2016, Alvin Kraenzlein is the only track-and-field athlete who has won four individual titles at one Olympics. Kraenzlein is also known for developing a pioneering technique of straight-leg hurdling, which allowed him to set two world hurdle records. He is an Olympic Hall of Fame (1984) and National Track and Field Hall of Fame (1974) inductee.

Berengar of Tours, in Latin Berengarius Turonensis, was an 11th-century French Christian theologian and archdeacon of Angers, a scholar whose leadership of the cathedral school at Chartres set an example of intellectual inquiry through the revived tools of dialectic that was soon followed at cathedral schools of Laon and Paris. Berengar of Tours was distinguished from mainline Catholic theology by two views: his assertion of the supremacy of Scripture and his denial of transubstantiation. According to Thomas Aquinas, in the Summa, "Berengarius ... withdrew his error and acknowledged the truth of the faith."

Sidney Poitier was a Bahamian-American actor, film director, activist, and diplomat. In 1964, he was the first black actor and first Bahamian to win the Academy Award for Best Actor. Among his other accolades are two competitive Golden Globe Awards, a BAFTA Award and a Grammy Award, in addition to nominations for two Emmy Awards and a Tony Award. In 1999, he was ranked number 22 among the "American Film Institute's 100 Stars". Poitier was one of the last surviving stars from the Golden Age of Hollywood.

Alessandro de' Medici, nicknamed "il Moro" due to his dark complexion, Duke of Penne and the first Duke of the Florentine Republic, was ruler of Florence from 1530 to his death in 1537. The first Medici to rule Florence as a hereditary monarch, Alessandro was also the last Medici from the senior line of the family to lead the city. His assassination at the hands of distant cousin Lorenzaccio caused the title of Duke to pass to Cosimo I de Medici, from the family's junior branch.

Francisco Sionil José was a Filipino writer who was one of the most widely read in the English language. A National Artist of the Philippines for Literature, which was bestowed upon him in 2001, José's novels and short stories depict the social underpinnings of class struggles and colonialism in Filipino society. His works—written in English—have been translated into 28 languages, including Korean, Indonesian, Czech, Russian, Latvian, Ukrainian and Dutch. He was often considered the leading Filipino candidate for the Nobel Prize in Literature.

Alan Anthony Wiggins was an American professional baseball player. He was a second baseman and outfielder in Major League Baseball (MLB) for the San Diego Padres and Baltimore Orioles between 1981 and 1987. A speedy leadoff hitter, Wiggins had his best season with the pennant-winning Padres in 1984. He batted one slot ahead of Tony Gwynn in the lineup that year, and the pair's offensive production helped the Padres win the National League Championship Series (NLCS) and advance to the World Series.

Richard Henry Dana Jr. was an American lawyer and politician from Massachusetts, a descendant of a colonial family, who gained renown as the author of the classic American memoir Two Years Before the Mast and as an attorney who successfully represented the U.S. government before the U.S. Supreme Court during the Civil War in the Prize Cases. Both as a writer and as a lawyer, he was a champion of the downtrodden, from seamen to fugitive slaves and freedmen.

John Birks "Dizzy" Gillespie was an American jazz trumpeter, bandleader, composer, educator, and singer. He was a trumpet virtuoso and improviser, building on the virtuosic style of Roy Eldridge but adding layers of harmonic and rhythmic complexity previously unheard in jazz. His combination of musicianship, showmanship, and wit made him a leading popularizer of early bebop styles. His beret and horn-rimmed spectacles, scat singing, bent horn, pouched cheeks, and light-hearted personality have made him an enduring icon.

Christopher of Bavaria was King of Denmark, Sweden (1441–48) and Norway (1442–48) during the era of the Kalmar Union. He ruled after the Kalmar Union's King Erik of Pomerania was deposed. Early in his reign, he put down two peasant rebellions in Funen and Jutland. He was disliked by the Swedish nobles, as they pointed to his inability to manage harvest failures and to stop Erik's plundering. They also questioned his foreign background.

On January 6, 2021, Ashli Babbitt, a 35-year-old American United States Air Force veteran and pool supply owner, was fatally shot by an officer during the attack on the United States Capitol. She was part of a mob of supporters of then-outgoing U.S. president Donald Trump who stormed the United States Capitol seeking to overturn his defeat in the 2020 presidential election. She was a supporter of QAnon, a far-right conspiracy theory.