Died on April 11

618 Emperor Yang of Sui the second son of Emperor Wen of Sui, and the second emperor of China's Sui dynasty.
678 Pope Donus Pope from 2 November 676 to his death in 678. He was the son of a Roman named Mauricius. Not much is known of this pope
1034 Romanos III Argyros Byzantine emperor from 15 November 1028 until his death.
1079 Stanislaus of Szczepanów a Bishop of Kraków known chiefly for having been martyred by the Polish king Bolesław II the Bold. Stanislaus is venerated in the Roman Catholic Church as Saint Stanislaus the Martyr
1165 Stephen IV of Hungary King of Hungary and Croatia, ascending to the throne in 1163 when he usurped the crown of his nephew, Stephen III. He was the third son of Béla II of Hungary, and when his conspiracy against his brother failed, Géza II, he was exiled from Hungary in the summer of 1157. He first sought refuge in the Holy Roman Empire, but received no support from Emperor Frederick Shortly afterwards he moved to the Byzantine Empire, where he married a niece of Emperor Manuel I Komnenos, Maria Komnene, and converted to the Orthodox Church
1240 Llywelyn the Great a Prince of Gwynedd in north Wales and eventually de facto ruler over most of Wales. By a combination of war and diplomacy he dominated Wales for 40 years
1447 Henry Beaufort a medieval English clergyman, Bishop of Winchester, an anomaly in being both a bishop and a member of the royal house of Plantagenet, and Cardinal.
1512 Gaston of Foix Duke of Nemours a French military commander noted mostly for his brilliant six-month campaign from 1511 to 1512 during the War of the League of Cambrai.
1520 Agostino Chigi an Italian banker and patron of the Renaissance.
1547 Dorothea of Denmark Duchess of Prussia a Danish princess and Duchess of Prussia. She was the daughter of King Frederick I of Denmark and Anna of Brandenburg. She was married to Duke Albert, Duke of Prussia
1554 Thomas Wyatt the Younger traditionally called "Wyatt's rebellion". He was also the son of the English poet and ambassador Sir Thomas Wyatt
1578 Joanna of Austria Grand Duchess of Tuscany born an Archduchess of Austria as the youngest daughter of Ferdinand I, Holy Roman Emperor, and Anna of Bohemia and Hungary. By marriage, she was the Grand Princess of Tuscany and later the Grand Duchess of Tuscany. One of her daughters was Marie de Medici, second wife of King Henry IV of France
1612 Emanuel van Meteren a Flemish historian and Consul for "the Traders of the Low Countries" in London. He was born in Antwerp, the son of Sir Jacobus van Meteren, Dutch financier and publisher of early English versions of the Bible, and Orrilia Ortellius, of the famous Ortellius family of mapmakers, and nephew of the cartographer Abraham Ortelius
1612 Edward Wightman an English radical Anabaptist, executed at Lichfield on charges of heresy. He was the last person to be burned at the stake for heresy in England
1626 Marin Getaldić a scientist from the Republic of Ragusa. A mathematician and physicist who studied in Italy, England and Belgium, his best results are mainly in physics, especially optics, and mathematics. He was one of the few students of François Viète
1712 Richard Simon (priest) a French priest and longtime Oratorian, who was an influential biblical critic, orientalist and controversialist.
1723 John Robinson (bishop of London) an English diplomat and prelate.
1760 Prince Moritz of Anhalt-Dessau a German prince of the House of Ascania from the Anhalt-Dessau branch. He was also a Prussian soldier and Generalfeldmarschall
1760 Louis de Silvestre a French portrait and history painter. He was court painter to King Augustus II of Poland, and director of the Royal Academy of Arts in Dresden
1779 Joseph de Jussieu a French botanist and explorer, member of the Jussieu family. He introduced the common garden heliotrope to European gardeners
1783 Nikita Ivanovich Panin an influential Russian statesman and political mentor to Catherine the Great for the first 18 years of her reign. In that role, he advocated the Northern Alliance, closer ties with Frederick the Great of Prussia and the establishment of an advisory privy council. His staunch opposition to the partitions of Poland led to his being replaced by the more compliant Prince Bezborodko
1794 Stanislas-Marie Maillard a captain of the Bastille Volunteers. As a national guardsman, he participated in the attack on the Bastille and accompanied the women who marched to Versailles on October 5, 1789. Maillard testified in court to the events at Versailles
1798 Karl Wilhelm Ramler a German poet.
1801 Antoine de Rivarol a Royalist French writer during the Revolutionary era.
1821 Georg Joseph Beer an Austrian ophthalmologist. He is credited with introducing a flap operation for treatment of cataracts , as well as popularizing the instrument used to perform the surgery
1824 Jean-Baptiste Drouet (French revolutionary) a French politician of the 1789 Revolution, chiefly noted for the part he played in the arrest of King Louis XVI during the Flight to Varennes.
1834 John 'Mad Jack' Fuller well known as a builder of follies, and as a philanthropist, patron of the arts and sciences, and a supporter of slavery. He purchased and commissioned many paintings from J.M.W. Turner. He was sponsor and mentor to Michael Faraday
1842 Sándor Kőrösi Csoma a Hungarian philologist and Orientalist, author of the first Tibetan-English dictionary and grammar book. He was called Phyi-glin-gi-grwa-pa in Tibetan, meaning "the foreign pupil" and was given the title of Bosatsu or Boddhisatva by the Japanese in 1933. He was born in Kőrös, Grand Principality of Transylvania. His birth date is often given as 4 April, although this is actually his baptism day and the year of his birth is debated by some authors who put it at 1787 or 1788 rather than 1784. The Magyar ethnic group, the Székelys, to which he belonged believed that they were derived from a branch of Attila's Huns who had settled in Transylvania in the fifth century. Hoping to study the claim and to find the place of origin of the Székelys and the Magyars by studying language kinship, he set off to Asia in 1820 and spent his lifetime studying the Tibetan language and Buddhist philosophy. Csoma de Kőrös is considered as the founder of Tibetology. He was said to have been able to read in seventeen languages. He died in Darjeeling while attempting to make a trip to Lhasa in 1842 and a memorial was erected in his honour by the Asiatic Society of Bengal
1851 Mikhail Lazarev a Russian fleet commander and an explorer.
1854 Karl Adolph von Basedow a German physician most famous for reporting the symptoms of what could later be dubbed Graves-Basedow disease, now technically known as exophthalmic goiter.
1856 Juan Santamaría a Costa Rican soldier, officially recognized as the national hero of his country. A national holiday in Costa Rica, Juan Santamaría Day, is held every April 11 to commemorate his death
1858 Franz Xaver Stöber an Austrian engraver and etcher.
1860 Camille Alphonse Trézel a French général de division, Minister for War and peer of France during the July Monarchy. He was Assistant Chief of the General Staff on the Morea expedition, and served in the 1830s in the French conquest of Algeria, where he suffered a disastrous defeat at the Battle of Macta
1861 Francisco González Bocanegra a Mexican poet who wrote the lyrics of the Mexican National Anthem in 1853.
1869 Claude-Philibert Barthelot comte de Rambuteau a French senior official of the first half of the 19th century. He was Préfet of the former Départment of the Seine, which included Paris, from 1833 to 1848. He established the groundwork for the fundamental transformation of Paris that Haussmann carried out under the Second Empire
1870 Justo José de Urquiza an Argentine general and politician. He was president of the Argentine Confederation from 1854 to 1860
1873 Edward Canby a career United States Army officer and a Union general in the American Civil War, Reconstruction era, and the Indian Wars. He was assassinated at a peace talk with the Modoc in Northern California. He was the only United States general to be killed during the later wars
1873 Christopher Hansteen a Norwegian geophysicist, astronomer and physicist, best known for his mapping of Earth's magnetic field.
1875 Heinrich Schwabe Samuel Heinrich Schwabe a German astronomer remembered for his work on sunspots.
1875 Andrew Jackson Hamilton a United States politician during the third quarter of the 19th century. He was a lawyer, state representative, military governor of Texas, as well as the 11th Governor of Texas during Reconstruction
1876 Ludwig Traube (physician) a German physician and co-founder of the experimental pathology in Germany.
1880 Jean Antoine Théodore de Gudin a French painter of the 19th century, born in Paris.
1880 William Sharpey a Scottish anatomist and physiologist.
1882 Ewelina Hańska a Polish noblewoman best known for her marriage to French novelist Honoré de Balzac. Born at the Wierzchownia estate in Volhynia, Hańska married landowner Wacław Hański when she was a teenager. Hański, who was about 20 years her senior, suffered from depression. They had five children, but only a daughter, Anna, survived
1890 Joseph Merrick an English man with severe deformities who was exhibited as a human curiosity named the Elephant Man. He became well known in London society after he went to live at the London Hospital. Merrick was born in Leicester, Leicestershire and began to develop abnormally during the first few years of his life. His skin appeared thick and lumpy, he developed an enlargement of his lips, and a bony lump grew on his forehead. One of his arms and both feet became enlarged and at some point during his childhood he fell and damaged his hip, resulting in permanent lameness. When he was 10, his mother died and his father soon remarried. Merrick left school at 13, and had difficulty finding employment. Rejected by his father and stepmother, he left home. In late 1879, aged 17, Merrick entered the Leicester Union Workhouse
1892 Carl Paul Caspari a Norwegian neo-Lutheran theologian and academic. He wrote several books and is best known for his interpretations and translation of the Old Testament
1893 Avdotya Panaeva a Russian novelist, short story writer, memoirist and literary salon holder. She published much of her work under the pseudonym Stanitsky
1894 Friedrich Neelsen a German pathologist.
1894 Karl August Klüpfel a German historian and librarian. He was a son-in-law of writer Gustav Schwab
1894 Constantin Lipsius a German architect and architectural theorist, best known for his controversial design of the Royal Academy of Fine Arts and Exhibition Building on the Brühl Terrace in Dresden, today known as the Lipsius-Bau.