Died on April 20

168 Pope Anicetus the Bishop of Rome from 157 to his death in 168. According to the Annuario Pontificio, the start of his papacy may have been 153. His name is Greek for unconquered. According to the Liber Pontificalis, Anicetus was a Syrian from the city of Emesa
689 Cædwalla of Wessex the King of Wessex from approximately 685 until he abdicated in 688. His name is derived from the British Cadwallon. He was exiled from Wessex as a youth and during his exile gathered forces and attacked the South Saxons, killing their king, Æthelwealh, in what is now Sussex. Cædwalla was unable to hold the South Saxon territory, however, and was driven out by Æthelwealh's ealdormen. In either 685 or 686 he became King of Wessex. He may have been involved in suppressing rival dynasties at this time, as an early source records that Wessex was ruled by underkings until Cædwalla
767 Taichō a shugendō monk in Nara period Japan. He was raised in Echizen Province, which was in the southern portion of present day Fukui Prefecture. He was the second son of Mikami Yasuzumi. He is said to be the first person to reach the top of Mount Haku in neighboring Kaga Province and other peaks in the Ryōhaku Mountains
888 Emperor Xizong of Tang an emperor of the Tang dynasty of China. He reigned from 873 to 888. He was the fifth son of his predecessor Emperor Yizong and was the elder brother of his successor Emperor Zhaozong. His reign saw his realm overrun by the great agrarian rebellions led by Wang Xianzhi and Huang Chao, and while both were eventually defeated, by the end of Emperor Xizong's reign, the Tang state had virtually disintegrated into pieces ruled by individual warlords, rather than the imperial government, and would never recover, falling eventually in 907
1089 Demetrius Zvonimir of Croatia King of Croatia from 1075 until his death. He was crowned as king in Solin on 8 October 1076. Zvonimir also ruled as Ban of Slavonia , and was named Duke of Croatia in around 1075. His native name was Zvonimir, while the name Demetrius was adopted at his coronation
1176 Richard de Clare 2nd Earl of Pembroke Lord of Leinster, Justiciar of Ireland. Like his father, he was also commonly known by his nickname Strongbow. He was a Cambro-Norman lord notable for his leading role in the Norman invasion of Ireland
1194 Odon of Poznań a Duke of Greater Poland and Poznań during 1177–1182, and Duke of Kalisz from 1193 to 1194.
1284 Hōjō Tokimune the eighth shikken of the Kamakura shogunate , known for leading the Japanese forces against the invasion of the Mongols and for spreading Zen Buddhism and by extension Bushido among the warrior class.
1313 Bolesław II of Masovia a ruler of Masovia. He was the younger brother Konrad II of Masovia and son of Siemowit I of Masovia. His mother was Pereyaslava, daughter of Daniel of Galicia
1314 Pope Clement V Pope from 5 June 1305 to his death in 1314. He is infamous for suppressing the order of the Knights Templar and allowing the execution of many of its members, and as the Pope who moved the Curia from Rome to Avignon, ushering in the period known as the Avignon Papacy
1434 Alexandra of Lithuania the youngest daughter of Algirdas, Grand Duke of Lithuania, and his second wife, Uliana of Tver. Though Alexandra's exact date of birth is not known, it is thought that she was born in the late 1360s or early 1370s. In 1387, she married Siemowit IV, Duke of Masovia, and bore him thirteen children
1472 Leon Battista Alberti an Italian humanist author, artist, architect, poet, priest, linguist, philosopher and cryptographer; he epitomised the Renaissance Man. Although he is often characterized as an "architect" exclusively, as James Beck has observed, "to single out one of Leon Battista's 'fields' over others as somehow functionally independent and self-sufficient is of no help at all to any effort to characterize Alberti's extensive explorations in the fine arts." Alberti's life was described in Giorgio Vasari's Lives of the Most Excellent Painters, Sculptors, and Architects
1504 Filippino Lippi an Italian painter working during the High Renaissance in Florence, Italy.
1517 Bogdan III the One-Eyed or Bogdan III the Blind Voivode of Moldavia from July 2, 1504 to 1517.
1521 Zhengde Emperor the Ming dynasty Emperor of China between 1505–1521. Born Zhu Houzhao, he was the Hongzhi Emperor's eldest son. His era name means "Right virtue" or "Rectification of virtue"
1534 Elizabeth Barton an English Catholic nun. She was executed as a result of her prophecies against the marriage of King Henry VIII of England to Anne Boleyn
1558 Johannes Bugenhagen also called Doctor Pomeranus by Martin Luther, introduced the Protestant Reformation in the Duchy of Pomerania and Denmark in the 16th century. Among his major accomplishments was organization of Lutheran churches in Northern Germany and Scandinavia. He has also been called second Apostle of the North
1578 Lady Mary Grey the youngest daughter of Henry Grey, 1st Duke of Suffolk, and Frances Brandon, and through her mother had a claim to the crown.
1640 Wilhelm Kettler the second Duke of Courland, a region of Latvia. Wilhelm ruled the western Courland portion of the Duchy of Courland and Semigallia while his brother Friedrich ruled the eastern Semigallia portion
1643 Christoph Demantius a German composer, music theorist, writer and poet. He was an exact contemporary of Monteverdi, and represented a transitional phase in German Lutheran music from the polyphonic Renaissance style to the early Baroque
1653 Celestyn Myślenta a Polish Lutheran theologian and rector of the University of Königsberg. Celestyn was the son of Mateusz Myślenta and Eufroza née Wiercinska. His father was once employed by Duke Radziwill and belonged to the Polish nobility. As a stipendiary of the duke of Prussia he studied at University Königsberg, then became Lutheran pastor in Kuty from 1581-1599
1676 John Clarke (Baptist minister) a medical doctor, Baptist minister, co-founder of the colony of Rhode Island and Providence Plantations, author of its influential charter, and a leading advocate of religious freedom in the Americas.
1690 Duchess Maria Anna Victoria of Bavaria Dauphine of France as spouse of Louis, Grand Dauphin, son and heir of Louis XIV. She was known as the Dauphine Marie Anne Victoire or la Grande Dauphine. The dauphine was a 'pathetic' figure at the court of France, isolated and unappreciated due to the perception that she was dull, unattractive and sickly
1703 Lancelot Addison an English writer and Church of England clergyman. He was born at Crosby Ravensworth in Westmorland. He was educated at the Queen's College, Oxford
1706 Hieronim Augustyn Lubomirski a Polish noble , magnate, politician and outstanding military commander. He was a Prince of the Holy Roman Empire SRI
1708 Damaris Cudworth Masham an English philosopher.
1750 Jean Louis Petit a French surgeon, and the inventor of the tourniquet. He was first enthusiastic about anatomy, received a master's certificate in surgery in Paris in 1700. He became a member of the French Royal Academy of Sciences in 1715, and was named director of the French Royal Academy of Surgery by the king when it was created in 1731. He acquired great notoriety because of his skill and experience, thanks to his case reports of hemorrhage, lacrimal fistula, operation on the frenum, for his treatise on bone diseases and especially for his general treatise on surgical operations, on which he worked 12 years and which was finished after his death by François-Dominique Lesne
1751 Gisela Agnes of Anhalt-Köthen a princess of Anhalt-Köthen by birth and by marriage Duchess of Anhalt-Dessau.
1769 Pontiac (person) an Ottawa war chief who became noted for his role in Pontiac's War , an American Indian struggle against British military occupation of the Great Lakes region and named for him. It followed the British victory in the French and Indian War, the North American front of the Seven Years' War. Pontiac's importance in the war that bears his name has been debated. Nineteenth-century accounts portrayed him as the mastermind and leader of the revolt, but some subsequent scholars argued that his role had been exaggerated. Historians today generally view him as an important local leader who influenced a wider movement that he did not command
1774 Aleksandr Bibikov a Russian statesman and military officer.
1786 John Goodricke an English amateur astronomer. He is best known for his observations of the variable star Algol in 1782
1795 Johan Henric Kellgren a Swedish poet and critic.
1804 Ernest II Duke of Saxe-Gotha-Altenburg the third but second surviving son of Frederick III, Duke of Saxe-Gotha-Altenburg and Luise Dorothea of Saxe-Meiningen. The death of his older brother Frederick in 1756 made him the heir to the duchy of Saxe-Gotha-Altenburg
1812 George Clinton (vice president) an American soldier and statesman, considered one of the Founding Fathers of the United States. He served as Governor of New York from 1777 to 1795, then again from 1801 to 1804, then serving as the fourth Vice President of the United States from 1805 to 1812, serving under Presidents Thomas Jefferson and James Madison. Until the election of Terry Branstad of Iowa in November 2014, he was the longest-serving governor in the history of the United States , and he and John Calhoun are the only persons to have served as Vice President under two different U.S. Presidents
1820 Alessandro Mattei an Italian Cardinal, and a significant figure in papal diplomacy of the Napoleonic period. He was from the Roman aristocratic House of Mattei
1820 James Morris III a Continental Army officer from Connecticut during the American Revolutionary War and founder of the Morris Academy, a pioneer in coeducation.
1821 Franz Karl Achard a German chemist, physicist and biologist. His principal discovery was the production of sugar from sugar beets
1831 Luigi Rolando an Italian anatomist known for his pioneer research in brain localization of function.
1831 John Abernethy (surgeon) an English surgeon. He is popularly remembered today for having given his name to the Abernethy biscuit, a coarse-meal baked good meant to aid digestion
1831 August Lafontaine a German novelist.
1836 Johann I Joseph Prince of Liechtenstein Prince of Liechtenstein between 1805 and 1806 and again from 1814 until 1836. He was the last Liechtenstein prince to rule under the Holy Roman Empire between 1805 and 1806 and as regent of Liechtenstein from 1806 until 1814. He was the fourth son of Franz Joseph I, Prince of Liechtenstein
1841 Thomas Gordon (British Army officer) a British army officer and historian. He is remembered for his role in the Greek War of Independence in the 1820s and 1830s and his History of the war published in 1833
1845 Thomas Phillips a leading English portrait and subject painter. He painted many of the great men of the day including scientists, artists, writers, poets and explorers
1853 Lewis Caleb Beck an American physician, botanist, chemist, and mineralogist.
1857 Benjamin Tappan an Ohio judge and Democratic politician who served in the Ohio State Senate and the United States Senate. He was an early settler of the Connecticut Western Reserve in northeastern Ohio and was one of the first settlers in Portage County and the founder of the city of Ravenna, Ohio
1857 Ivan Kupreyanov the head of the Russian-American Company in Russian America from 1835 to 1840. Kupreyanov entered the Sea Cadet Corps while being only 10, in 1809. Kupreyanov served on the Mirny under captain Mikhail Lazarev during a circumnavigation led by Faddey Bellingshausen. Besides the discovery of Antarctica, island chains in the Pacific and Southern Oceans. He participated in an additional circumnavigation by Lazarev that lasted through 1822 to 1824. With the rank of Captain lieutenant Kupreyanov commanded a frigate and fought in the Black Sea against the Ottoman Navy during the Russo-Turkish War
1867 John Bozeman born in Pickens County, Georgia. He was an early Montana pioneer and helped create the Bozeman Trail through Wyoming Territory into the gold fields of southwest Montana Territory. He helped found his namesake city of Bozeman, Montana in 1864
1869 Carl Loewe a German composer, baritone singer and conductor. In his lifetime, his songs were well enough known for some to call him the "Schubert of North Germany", and Hugo Wolf came to admire his work. He is less known today, but his ballads and songs, which number over 400, are occasionally performed
1872 Andrej Sládkovič a Slovak poet, critic, publicist and translator.
1872 Ljudevit Gaj a Croatian linguist, politician, journalist and writer. He was one of the central figures of the pan-Slavist Illyrian Movement