Died in 1820

Jan 8 Demasduit a Beothuk woman, one of the last of her people on the island of Newfoundland, Canada.
Jan 9 Ferdinand Jagemann a German painter.
Jan 14 Princess Wilhelmina Caroline of Denmark the Electress of Hesse-Kassel.
Jan 20 Frederick V Landgrave of Hesse-Homburg from 1751 to his death landgrave of Hesse-Homburg. He was the son of Frederick IV, Landgrave of Hesse-Homburg and Ulrike Louise of Solms-Braunfels , daughter of Frederick William, Prince of Solms-Braunfels
Jan 23 Prince Edward Duke of Kent and Strathearn the fourth son of King George III of the United Kingdom and the father of Queen Victoria. Recently he has been styled the "Father of the Canadian Crown."
Jan 25 Joseph Franz Weigl a Bavarian and Austrian cellist. He was a cellist in the orchestra of the Esterházy family. He played under the directorship of Joseph Haydn, who also was godfather to the cellist's son, and it is thought that Haydn wrote his cello concerto in C major for him
Jan 29 George III of the United Kingdom King of Great Britain and King of Ireland from 25 October 1760 until the union of these two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death. He was concurrently Duke and prince-elector of Brunswick-Lüneburg in the Holy Roman Empire until his promotion to King of Hanover on 12 October 1814. He was the third British monarch of the House of Hanover, but unlike his two Hanoverian predecessors he was born in Britain, spoke English as his first language, and never visited Hanover
Jan 30 Josepha Barbara Auernhammer an Austrian pianist and composer.
Feb 3 Gia Long the first Emperor of the Nguyễn Dynasty of Vietnam. Unifying what is now modern Vietnam in 1802, he founded the Nguyễn Dynasty, the last of the Vietnamese dynasties
Feb 5 Tadeusz Brzozowski Very Rev. Tadeusz Brzozowski, S.J. was a Polish Jesuit, elected 19th Superior General of the Society of Jesus
Feb 7 Samuel Adams Holyoke an American composer and teacher of vocal and instrumental music, was the son of Rev. Elizur Holyoke and Hannah Peabody. He was born October 15, 1762 in Boxford, Massachusetts, and died February 7, 1820 in Concord, New Hampshire. He was a Congregationalist and a Mason, and never married
Feb 11 Karl von Fischer a German architect. His drafts had enormous influence on the architecture of neo-classicism in South Germany
Feb 14 Charles Ferdinand Duke of Berry the third child and youngest son of the future king, Charles X of France, and his wife, Princess Maria Theresa of Savoy. He was assassinated at the Paris Opera in 1820 by Louis Pierre Louvel, an anti-royal bonapartist. In June 1832, two years after the overthrow of his father, Charles X, his widow, Marie-Caroline de Bourbon-Sicile, duchess de Berry, led a royalist insurrection in the Vendée in a failed attempt to restore their son to the French throne
Feb 14 Cosme Argerich a pioneer of military medical practices in Argentina.
Feb 15 Pierre-Joseph Cambon a French statesman.
Feb 16 Georg Carl von Döbeln a Swedish friherre , Lieutenant General and war hero.
Feb 18 Lavinia Fisher reported by some legends to be the first female serial killer in the United States of America. Her origins are unknown; however, Fisher resided in the United States for much of her life. She was married to John Fisher, and both were convicted of murder and robbery. Historians have begun to question the veracity of the traditional legend and some assert she never killed anyone
Feb 22 Margravine Elisabeth Louise of Brandenburg-Schwedt a Prussian princess. She was a daughter of Margrave Frederick William of Brandenburg-Schwedt and his wife Princess Sophia Dorothea of Prussia
Feb 28 Johann Christian Rosenmüller a German anatomist born near Hildburghausen, Thuringia. He was the son of theologian Johann Georg Rosenmüller
Feb 29 Johann Joachim Eschenburg a German critic and literary historian.
Mar 11 Benjamin West an Anglo-American painter of historical scenes around and after the time of the American War of Independence. He was the second president of the Royal Academy in London, serving from 1792 to 1805 and 1806 to 1820. He was offered a knighthood by the British Crown, but declined it, believing that he should instead be made a peer
Mar 12 Alexander Mackenzie (explorer) a Scottish explorer. He is known for his overland crossing of what is now Canada to reach the Pacific Ocean in 1793. This was the first east to west crossing of North America north of Mexico and predated the Lewis and Clark expedition by 10 years
Mar 15 Clemens Maria Hofbauer a hermit and later a priest of the Redemptorist congregation. He is considered a co-founder of the congregation and is a patron saint of Vienna
Mar 22 Stephen Decatur a United States naval officer and Commodore notable for his many naval victories in the early 19th century.
Mar 26 Jean-Étienne Despréaux a French ballet dancer, choreographer, composer, singer and playwright.
Mar 27 Gerhard von Kügelgen a German painter, noted for his portraits and history paintings. He was a professor at the Academy of Arts in Dresden and a member of both the Prussian and Russian Academies of Arts. His twin brother, Karl von Kügelgen, was also a painter of note
Apr 2 Thomas Brown (philosopher) a Scottish philosopher and poet.
Apr 7 Carl Olof Cronstedt a Swedish naval commander responsible for the overwhelming Swedish victory at the Second Battle of Svensksund, one of the largest naval battles in history. He is often better remembered, however, as the commander of the fortress of Sveaborg during the Finnish War in 1808–09, which was fought between Sweden and Imperial Russia, and ended in Cronstedt surrendering the fortress
Apr 8 Thomas Douglas 5th Earl of Selkirk a Scottish peer. He was born at Saint Mary's Isle, Kirkcudbrightshire, Scotland. He was noteworthy as a Scottish philanthropist who sponsored immigrant settlements in Canada at the Red River Colony
Apr 9 Angelo Anelli an Italian poet and librettist who also wrote under the pseudonyms Marco Landi and Niccolò Liprandi. He was born in Desenzano del Garda and studied literature and poetry at a seminary in Verona. In 1793 he enrolled in the University of Padua, receiving a degree in Canon and Civil Law two years later. Active in the politics of the Cisalpine Republic in his youth, he was imprisoned twice. His 1789 sonnet on the vicissitudes of Italy under Austrian domination ,"La calamità d'Italia" , was for a long time incorrectly attributed to Ugo Foscolo
Apr 12 Arthur Young (agriculturist) an English writer on agriculture, economics, social statistics, and campaigner for the rights of agricultural workers.
Apr 14 Levi Lincoln Sr. an American revolutionary, lawyer, and statesman from Massachusetts. A Democratic-Republican, he most notably served as Thomas Jefferson's first Attorney General, and played a significant role in the events that led to the celebrated Marbury Madison court case. He served two terms as Lieutenant Governor of Massachusetts, acting as Governor for the remainder of Governor James Sullivan's term after his death in December 1808. Lincoln was unsuccessful in his bid to be elected governor in his own right in 1809
Apr 20 James Morris III a Continental Army officer from Connecticut during the American Revolutionary War and founder of the Morris Academy, a pioneer in coeducation.
Apr 20 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
Apr 25 Constantin François de Chassebœuf comte de Volney a French philosopher, abolitionist, historian, orientalist, and politician. He was at first surnamed Boisgirais after his father's estate, but afterwards assumed the name of Volney
May 1 Lorenzo Litta an Italian littérateur and churchman, who became a Cardinal.
May 17 Vincenzo Brenna an Italian architect and painter who was the house architect of Paul I of Russia. Brenna was hired by Paul and his spouse Maria Fyodorovna as interior decorator in 1781 and by the end of 1780s became the couple's leading architect. Brenna worked on Pavlovsk Palace and Gatchina palaces, rebuilt Saint Isaac's Cathedral, and most notably created Saint Michael's Castle in Saint Petersburg. Most of his architectural works were created concurrently during Paul's brief reign. Soon after Paul was murdered in a palace coup Brenna, renowned for fraud and embezzlement barely tolerated by his late patron, retired and left Russia for an uneventful life in Saxony
May 20 Karl Ludwig Sand a German university student and member of a liberal Burschenschaft. He was executed in 1820 for the murder of the conservative dramatist August von Kotzebue the previous year in Mannheim. As a result of his execution, Sand became a martyr in the eyes of many German nationalists seeking the creation of a united German national state
May 23 Richard Grindall an officer in the British Royal Navy whose distinguished career during the American War of Independence, the French Revolutionary War and the Napoleonic Wars was highlighted by his presence at the battle of Trafalgar in 1805, Despite being slow and ungainly, his 98-gun ship Prince was instrumental in the final stages of the battle and especially in the chaotic storm which followed, when many of the British fleet would have been lost but for the efforts of Grindall and other captains of largely undamaged ships.
May 24 Francisco Antonio Mourelle a Galician naval officer and explorer serving the Spanish crown. He was born in 1750 at San Adrián de Corme , near La Coruña, Galicia
Jun 6 Henry Grattan an Irish politician and member of the Irish House of Commons and a campaigner for legislative freedom for the Irish Parliament in the late 18th century. McDowell says that he was:
Jun 9 Wilhelmine Gräfin von Lichtenau the official mistress of King Frederick William II of Prussia from 1769 until 1797 and was elevated by him into the nobility. She is regarded as politically active and influential in the policy of Prussia during his reign
Jun 9 Wilhelmina of Prussia Princess of Orange the consort of William V of Orange and the de facto leader of the dynastic party and ounter-revolution in the Netherlands. She was the daughter of Prince Augustus William of Prussia and Luise of Brunswick-Wolfenbüttel. Wilhelmina was the longest serving Princess consort of Orange
Jun 9 Judith Sargent Murray an early American advocate for women's rights, an essayist, playwright, poet, and letter writer. She was one of the first American proponents of the idea of equality of the sexes—that women, like men, had the capability of intellectual accomplishment and should be able to achieve economic independence. Among many other influential pieces, her landmark essay "On the Equality of the Sexes" paved the way for new thoughts and ideas proposed by other feminist writers of the century
Jun 12 José Mariano Mociño a naturalist from New Spain.
Jun 19 Joseph Banks an English naturalist, botanist and patron of the natural sciences.
Jun 20 Manuel Belgrano an Argentine economist, lawyer, politician, and military leader. He took part in the Argentine Wars of Independence and created the Flag of Argentina. He is regarded as one of the main Libertadores of the country
Jun 21 Alexis Thérèse Petit a French physicist.
Jul 11 Frederick Traugott Pursh a German-American botanist.
Jul 16 Johann von Böber a German teacher, entomologist and botanist. He was first a professor at Peter's College Jelgava then in 1796. became an advisor to the Academy of Sciences in Petersburg. In 1809 he wrote Description de quelques nouvelles espèces de papillons découverts en Sibérie Mém. Soc. Imp. Nat. Mosco 2: 305-310, 1pl. His botanical works are