Died on April 21

303 Alexandra of Rome Christian saint, known from "Martyrdom of Saint George" as Emperor Diocletian's wife. She is also sometimes called Priscilla or Prisca
941 Bajkam a Turkish military commander and official of the Abbasid Caliphate. A former ghulam of the Ziyarid dynasty, Bajkam entered Abbasid service following the assassination of the Ziyarid ruler Mardavij in 935. During his five-year tenure at the Caliphate's court at Baghdad, he was granted the title of amir al-umara, consolidating his dominance over the Caliphs al-Radi and al-Muttaqi and giving him absolute power over their domains. Bajkam was challenged throughout his rule by various opponents, including his predecessor as amir al-umara, Ibn Ra'iq, the Basra-based Baridis, and the Buyids of Iran, but he succeeded in retaining control until his death. He was murdered by a party of Kurds during a hunting excursion in 941, shortly after the accession of al-Muttaqi as Caliph. Bajkam was known both for his firm rule and for his patronage of Baghdad intellectuals, who respected and in some cases befriended him. His death led to a void in central power, resulting in a brief period of instability and fighting in Baghdad
1073 Pope Alexander II Pope from 30 September 1061 to his death in 1073.
1109 Anselm of Canterbury a Benedictine monk, philosopher, and prelate of the Church, who held the office of Archbishop of Canterbury from 1093 to 1109. Called the founder of scholasticism, he has been a major influence in Western theology and is famous as the originator of the ontological argument for the existence of God and the satisfaction theory of atonement
1136 Stephen Count of Tréguier a Breton noble and a younger son of Odo, Count of Penthièvre and Agnes of Cornouaille, sister of Hoel II, Duke of Brittany. In 1093, he succeeded to the title of Count of Tréguier; in 1098, he succeeded his brother Alain as Lord of Richmond in Yorkshire, England
1142 Peter Abelard a medieval French scholastic philosopher, theologian and preeminent logician. He was also a composer. His affair with and love for Héloïse d'Argenteuil has become legendary. The Chambers Biographical Dictionary describes him as "the keenest thinker and boldest theologian of the 12th Century"
1213 Maria of Montpellier by birth heiress and later Sovereign Lady of Montpellier and by her three marriages Viscountess of Marseille, Countess of Comminges and Queen of Aragon.
1329 Frederick IV Duke of Lorraine the Duke of Lorraine from 1312 to his death.
1509 Henry VII of England King of England and Lord of Ireland from his seizing the crown on 22 August 1485 until his death on 21 April 1509, as the first monarch of the House of Tudor.
1552 Petrus Apianus a German humanist, known for his works in mathematics, astronomy and cartography.
1557 Girolamo Parabosco an Italian writer, composer, organist, and poet of the Renaissance.
1561 Lucrezia de' Medici Duchess of Ferrara the daughter of Cosimo I de' Medici, Grand Duke of Tuscany, and Eleanor of Toledo.
1574 Cosimo I de' Medici Grand Duke of Tuscany the second Duke of Florence from 1537 until 1569, when he became the first Grand Duke of Tuscany.
1582 Francisco de Toledo an aristocrat and military of the Kingdom of Spain, which was the fifth Viceroy of Peru.
1591 Sen no Rikyū considered the historical figure with the most profound influence on chanoyu, the Japanese "Way of Tea", particularly the tradition of wabi-cha. He was also the first to emphasize several key aspects of the ceremony, including rustic simplicity, directness of approach and honesty of self. Originating from the Sengoku period and the Azuchi–Momoyama period, these aspects of the tea ceremony persist. Rikyū is known by many names; for convenience this article will refer to him as Rikyū throughout
1597 Severyn Nalyvaiko a leader of the Ukrainian Cossacks who became a hero of Ukrainian folklore. He led the Nalyvaiko Uprising. The Decembrist poet Kondraty Ryleyev wrote a poem about him
1644 Torsten Stålhandske a Finnish officer in the Swedish army during the Thirty Years' War.
1652 Pietro Della Valle an Italian who traveled throughout Asia during the Renaissance period. His travels took him to the Holy Land, the Middle East, Northern Africa, and as far as India
1672 Antoine Godeau a French bishop, poet and exegete. He is now known for his work of criticism Discours de la poésie chrétienne from 1633
1699 Jean Racine a French dramatist, one of the three great playwrights of 17th-century France , and an important literary figure in the Western tradition. Racine was primarily a tragedian, producing such "examples of neoclassical perfection" as Phèdre, Andromaque, and Athalie, although he did write one comedy, Les Plaideurs, and a muted tragedy, Esther, for the young
1701 Asano Naganori the daimyo of the Akō Domain in Japan. His title was Takumi no Kami. He is known as the person who triggered a series of incidents retold in a story known as Chūshingura, one of the favourite themes of kabuki, jōruri, and Japanese books and films
1709 George XI of Kartli a Georgian monarch who ruled the Kingdom of Kartli as a Safavid Persian subject from 1676 to 1688 and again from 1703 to 1709. He is best known for his struggle against the Safavids which dominated his weakened kingdom and later as a Safavid commander-in-chief in what is now Afghanistan. Being an Eastern Orthodox Christian, he converted to Islam prior to his appointment as governor of Kandahar
1718 Philippe de La Hire a French mathematician and astronomer. According to Bernard le Bovier de Fontenelle he was an "academy unto himself"
1720 Antoine Hamilton an Irish classical author of near Scottish ancestry, who wrote in French. His literary characteristics are decidedly French
1722 Robert Beverley Jr. an important historian of early colonial Virginia. He was born in Jamestown and died in King and Queen County, Virginia. He was also a substantial planter of the time as well as an official in the colonial government
1731 Maurice Wilhelm Duke of Saxe-Merseburg a duke of Saxe-Merseburg and member of the House of Wettin.
1736 Prince Eugene of Savoy a general and statesman of the Holy Roman Empire and the Austrian monarchy and one of the most successful military commanders in modern European history, rising to the highest offices of state at the Imperial court in Vienna. Born in Paris, Eugene grew up around the French court of King Louis XIV. Based on his poor physique and bearing, the Prince was initially prepared for a career in the church, but by the age of 19 he had determined on a military career. Rejected by Louis XIV for service in the French army, Eugene moved to Austria and transferred his loyalty to the Habsburg Monarchy
1740 Thomas Tickell a minor English poet and man of letters.
1768 Alexey Bestuzhev-Ryumin one of the most influential and successful European diplomats of the 18th century. He was chiefly responsible for Russian foreign policy during the reign of Empress Elizaveta Petrovna
1785 Frederick II Duke of Mecklenburg-Schwerin Duke of Mecklenburg-Schwerin from 1756 until his death.
1785 Countess Charlotte of Dohna-Leistenau a German noble woman.
1792 Tiradentes a leading member of the Brazilian revolutionary movement known as the Inconfidência Mineira whose aim was full independence from the Portuguese colonial power and to create a Brazilian republic. When the plan was discovered, Tiradentes was arrested, tried and publicly hanged. Since the 19th century he has been considered a national hero of Brazil and patron of the Military Police
1815 Joseph Winston Col. Joseph Winston was an American pioneer, planter and Revolutionary War hero from North Carolina, and the first cousin of statesman and Virginia governor Patrick Henry. In 1766, Winston moved to the northern part of Rowan County, North Carolina, the area which subsequently became the current Stokes County, North Carolina
1825 Johann Friedrich Pfaff a German mathematician. He was described as one of Germany's most eminent mathematicians during the 19th century. He was a precursor of the German school of mathematical thinking, which under Carl Friedrich Gauss and his followers largely determined the lines on which mathematics developed during the nineteenth century
1827 Thomas Rowlandson an English artist and caricaturist.
1831 Josef August Schultes an Austrian botanist and professor from Vienna. Together with Johann Jacob Roemer , he published the 16th edition of Linnaeus' Systema Vegetabilium. In 1821, he was elected a foreign member of the Royal Swedish Academy of Sciences. He was the father of Julius Hermann Schultes
1831 Thursday October Christian I the first son of Fletcher Christian and his Tahitian wife Mauatua. He was conceived on Tahiti, and was the first child born on the Pitcairn Islands after the mutineers took refuge on the island. Born on a Thursday in October, he was given his unusual name because Fletcher Christian wanted his son to have "no name that will remind me of England."
1835 Samuel Slater an early English-American industrialist known as the "Father of the American Industrial Revolution" and the "Father of the American Factory System." In the UK he was called "Slater the Traitor" because he brought British textile technology to America, modifying it for United States use. He learned textile machinery as an apprentice to a pioneer in the British industry. Immigrating to the United States at the age of 21, he designed the first textile mills, and later went into business for himself, developing a family business with his sons. A wealthy man, he eventually owned thirteen spinning mills, and had developed tenant farms and company towns around his textile mills, such as Slatersville, Rhode Island
1836 Manuel Fernández Castrillón a major general in the Mexican army of the 19th century. He was a close friend of General and Mexican President Antonio López de Santa Anna
1839 Pavel Svinyin a prolific Russian writer, painter, and editor known as a "Russian Munchausen" for many exaggerated accounts of his travels. He was Appolon Maykov's brother-in-law and Aleksey Pisemsky's father-in-law
1841 Alexander Shishkov a Russian statesman, writer, and admiral.
1842 Bertrand Clausel a marshal of France.
1843 Prince Augustus Frederick Duke of Sussex the sixth son of George III of the United Kingdom and his consort, Charlotte of Mecklenburg-Strelitz. He was the only surviving son of George III who did not pursue an army or naval career
1844 Henry Baldwin (judge) an Associate Justice of the Supreme Court of the United States from January 18, 1830, to April 21, 1844.
1847 Friedrich von Gärtner a German architect.
1851 James Barron an officer in the United States Navy. He served in the Quasi War, the Barbary Wars, during which time he commanded a number of famous ships, including the USS Essex and the USS President. As Commander of the frigate USS Chesapeake, he was court-martialed for his actions in 1807, which led to the surrender of his ship to the British. After criticism from some fellow officers, the resulting controversy led Barron to a duel with Stephen Decatur, one of the officers who presided over his court-martial. Suspended from command, he pursued commercial interests in Europe during the War of 1812. Barron finished his naval career on shore duty, becoming the Navy's senior officer in 1839
1852 Ivan Nabokov a Russian Adjutant general and general of infantry prominent during the Napoleonic wars.
1859 Otto Sendtner a German botanist and phytogeographer born in Munich.
1863 Sir Robert Bateson 1st Baronet an Irish baronet, landowner and Conservative politician.
1865 Josef Matěj Navrátil a Czech painter.