Notable Deaths on December 1

Henry I, also known as Henry Beauclerc, was King of England from 1100 to his death in 1135. He was the fourth son of William the Conqueror and was educated in Latin and the liberal arts. On William's death in 1087, Henry's elder brothers Robert Curthose and William Rufus inherited Normandy and England, respectively, thereby leaving Henry landless. He subsequently purchased the County of Cotentin in western Normandy from Robert, but his brothers deposed him in 1091. He gradually rebuilt his power base in the Cotentin and allied himself with William Rufus against Robert.

Sandra Day O'Connor was an American attorney, politician, and jurist who served as an associate justice of the Supreme Court of the United States from 1981 to 2006. Nominated by President Ronald Reagan, O'Connor was the first woman to serve as a U.S. Supreme Court justice. A moderate conservative, she was considered a swing vote. Before O'Connor's tenure on the Court, she was an Arizona state judge and earlier an elected legislator in Arizona, serving as the first female majority leader of a state senate as the Republican leader in the Arizona Senate. Upon her nomination to the Court, O'Connor was confirmed unanimously by the United States Senate.

Gaylord Jackson Perry was an American right-handed pitcher in Major League Baseball (MLB) who played for eight teams from 1962 to 1983, becoming one of the most durable and successful pitchers in history. A five-time All-Star, Perry was the first pitcher to win the Cy Young Award in both leagues. He won the American League (AL) award in 1972 after leading the league with 24 wins with a 1.92 earned run average (ERA) for the fifth-place Cleveland Indians and took the National League (NL) award in 1978 with the San Diego Padres after again leading the league with 21 wins; his Cy Young Award announcement just as he turned the age of 40 made him the oldest to win the award, which stood as a record for 26 years until Roger Clemens won the Cy Young in 2004 at 42 years old. He and his older brother Jim Perry, who were Cleveland teammates in 1974–1975, became the first brothers to both win 200 games in the major leagues and remain the only brothers to both win Cy Young Awards.

Alfred Thayer Mahan was a United States Navy (USN) officer and historian whom John Keegan called "the most important American strategist of the nineteenth century." His 1890 book The Influence of Sea Power upon History, 1660–1783 won immediate recognition, especially in Europe, and with the publication of its 1892 successor, The Influence of Sea Power upon the French Revolution and Empire, 1793–1812, he affirmed his status as a globally-known and regarded military strategist, historian, and theorist. Mahan's works encouraged the development of large capital ships—eventually leading to dreadnought battleships—as he was an advocate of the 'decisive battle' and of naval blockades.

John Burdon Sanderson Haldane, nicknamed "Jack" or "JBS", was a British-born scientist and polymath, and a foundational figure in the modern synthesis of evolutionary biology. He worked in the fields of physiology, genetics, evolutionary biology, and mathematics. With innovative use of statistics in biology, he was one of the founders of neo-Darwinism. Largely self-taught in biology, he held professorships at the University of Cambridge, the Royal Institution, and University College London. Renouncing his British citizenship, he became an Indian citizen in 1961 and worked at the Indian Statistical Institute until his death in 1964.

Charles de Foucauld, born as Charles Eugène, vicomte de Foucauld de Pontbriand, in religion Charles of Jesus, was a French monk, Catholic priest and hermit who lived among the Tuareg people in the Sahara in Algeria. He was also an explorer, geographer, ethnographer. Before joining the Trappists as a monk, he was a soldier in the 2nd Hussar Regiment. He was murdered by Bedouin bandits in 1916. His inspiration and writings led to the founding of a number of religious congregations inspired by his example. He was canonized in 2022.

Claude Marcelle Jorré, better known as Claude Jade, was a French actress. She starred as Christine in François Truffaut's three films Stolen Kisses (1968), Bed and Board (1970) and Love on the Run (1979). Jade acted in theatre, film and television. Her film work outside France, where she displays her talent in works such as My Uncle Benjamin (1969), The Boat on the Grass (1971) or The Pawn (1978), has Claude Jade included the Soviet Union, the United States, Italy, Belgium, Germany and Japan. She was most famous on television as the heroine of the mysterious adventure series The Island of Thirty Coffins (1979). She was also the leading actress in the first French daily soap opera, Cap des Pins (1998–2000). Her last role was playing Célimène in the 2006 theatre play and film Célimène et le cardinal.

David Arthur McNally was an American professional baseball player. He played in Major League Baseball as a left-handed pitcher from 1962 through 1975, most notably as a member of the Baltimore Orioles dynasty that won four American League pennants and two World Series championships between 1966 and 1971. A three-time All-Star, McNally won 20 or more games for four consecutive seasons from 1968 through 1971. He was one of four 20-game winners for the 1971 Orioles, the last team as of 2025 to have four 20-win pitchers on the same roster.

Endicott Howard Peabody was an American politician from Massachusetts. A Democrat, he served a single two-year term as the 62nd governor of Massachusetts, from 1963 to 1965. His tenure is probably best known for his categorical opposition to the death penalty and for signing into law the bill establishing the University of Massachusetts Boston. After losing the 1964 Democratic gubernatorial primary, Peabody made several more failed bids for office in Massachusetts and New Hampshire, including failed campaigns for the U.S. Senate in 1966 and 1986.

ʿAlāʾ al-Dīn Muḥammad III, more commonly known as ʿAlāʾ al-Dīn, son of Jalāl al-Dīn Ḥasan III, was the 26th Nizāri Isma'ilism Imām. He ruled the Nizari Ismaili state from 1221 to 1255. By some accounts, he was considered a respected scholar and the spiritual and worldly leader of the Nisari Ismailis. The intellectual life of Persia has been described as having flourished during his 34-year reign. Allegedly, he was known for his tolerance and pluralism. His reign witnessed the beginnings of the Mongol conquests of Persia and the eastern Muslim world. He was assassinated by an unknown perpetrator on 1 December 1255, and was succeeded by his eldest son, Rukn al-Din Khurshah, in 1255.

Kenneth Bruce McGregor was an Australian tennis player from Adelaide who won the Men's Singles title at the Australian Championships in 1952. He and his longtime doubles partner, Frank Sedgman, are generally considered one of the greatest men's doubles teams of all time and won the doubles Grand Slam in 1951. McGregor was also a member of three Australian Davis Cup winning teams in 1950–1952. In 1953, Jack Kramer induced both Sedgman and McGregor to turn professional. He was ranked as high as World No. 3 in 1952.

Joseph Bitner Wirthlin was an American businessman, religious leader and member of the Quorum of the Twelve Apostles of the Church of Jesus Christ of Latter-day Saints. He was sustained to the Twelve on October 4, 1986, and ordained an apostle on October 9, 1986, by Thomas S. Monson. He became an apostle following the death of church president Spencer W. Kimball. As a member of the Quorum of the Twelve, Wirthlin was accepted by the church membership as a prophet, seer, and revelator.

George "Punch" Imlach was a Canadian ice hockey coach and general manager best known for his association with the Toronto Maple Leafs, whom he was with from 1958 to 1969, and again from 1979 to 1981, and the Buffalo Sabres, whom he was with from 1970 to 1978. With Toronto he won the Stanley Cup four times, from 1962 to 1964 and again in 1967. He is a member of the Hockey Hall of Fame, and the Ontario Sports Hall of Fame.

Lorenzo Ghiberti was an Italian Renaissance sculptor from Florence, a key figure in the Early Renaissance, best known as the creator of two sets of bronze doors of the Florence Baptistery, the later one called by Michelangelo the Gates of Paradise. Trained as a goldsmith and sculptor, he established an important workshop for sculpture in metal. His book of Commentarii contains important writing on art, as well as what may be the earliest surviving autobiography by any artist.

Charlie Kerins was a physical force Irish Republican, and Chief of Staff of the Irish Republican Army (IRA). Kerins was one of six IRA men who were executed by the Irish State between September 1940 and December 1944. After spending two years on the run he was captured by the police in 1944. Following his subsequent trial and conviction for the 1942 murder of Garda Detective Sergeant Denis O'Brien, Kerins was hanged at Mountjoy Prison in Dublin.

Ellis Roderick Dungan was an American film director, who was well known for working in Indian films, predominantly in Tamil cinema, from 1936 to 1950. He was an alumnus of the University of Southern California and moved to India in 1935. During his film career in South India, Dungan directed the debut films of several popular Tamil film actors, such as M. G. Ramachandran in Sathi Leelavathi, T. S. Balaiya, Kali N. Ratnam and N. S. Krishnan.

Edward James "Babe" Heffron was a private with E Company, 2nd Battalion, 506th Parachute Infantry Regiment, in the 101st Airborne Division of the United States Army during World War II. Heffron was portrayed in the HBO miniseries Band of Brothers by Robin Laing. In 2007, Heffron wrote Brothers in Battle, Best of Friends: Two WWII Paratroopers from the Original Band of Brothers Tell Their Story with fellow veteran William "Wild Bill" Guarnere and journalist Robyn Post.

Jacob Nelson Fox was an American professional baseball player. Fox was one of the best second basemen of all time, and the third-most difficult hitter to strike out in Major League Baseball (MLB) history. Fox played in the big leagues from 1947 through 1965 and spent the majority of his career as a member of the Chicago White Sox; his career was bookended by multi-year stints for the Philadelphia Athletics and, later, the Houston Astros.

Edmund Campion, SJ was an English Jesuit priest and martyr. While conducting an underground ministry in officially Anglican England, Campion was arrested by priest hunters. Convicted of high treason, he was hanged, drawn and quartered at Tyburn. Campion was beatified by Pope Leo XIII in 1886 and canonised in 1970 by Pope Paul VI as one of the Forty Martyrs of England and Wales. His feast day is celebrated on 1 December.