Born on June 21

1002 Pope Leo IX Pope from 12 February 1049 to his death in 1054. He was a German aristocrat and a powerful secular ruler of central Italy while holding the papacy. He is regarded as a saint by the Roman Catholic Church, his feast day celebrated on 19 April
1226 Bolesław V the Chaste Duke of Sandomierz in Lesser Poland from 1232 and High Duke of Poland from 1243 until his death.
1390 Blessed Margaret of Savoy Marchioness of Montferrat, and a Dominican Sister.
1521 John II Duke of Schleswig-Holstein-Haderslev the only Duke of Schleswig-Holstein-Haderslev. The predicate the Elder is sometimes used to distinguish him from his nephew John the Younger, who held Sønderborg from 1564 as a partitioned-off duke. As a co-ruler in the duchies of Holstein and of Schleswig John the Elder is numbered Duke John II, continuing counting John of Denmark as Duke John I of Holstein and of Schleswig
1528 Maria of Austria Holy Roman Empress the spouse of Maximilian II, Holy Roman Emperor and King of Bohemia and Hungary. She was the daughter of Emperor Charles V and twice served as regent of Spain
1535 Leonhard Rauwolf a German physician, botanist, and traveller. His main notability arises from a trip he made through the Levant and Mesopotamia in 1573-75. The motive of the trip was to search for herbal medicine supplies. Shortly after he returned, he published a set of new botanical descriptions with an herbarium. Later he published a general travel narrative about his visit
1587 Kaspar von Barth a German philologist and writer.
1639 Increase Mather a major figure in the early history of the Massachusetts Bay Colony and Province of Massachusetts Bay. He was a Puritan minister who was involved with the government of the colony, the administration of Harvard College, and most notoriously, the Salem witch trials. He was the son of Richard Mather, and the father of Cotton Mather, both influential Puritan ministers
1640 Abraham Mignon a Dutch golden age painter, specialized in flower bouquets.
1646 Maria Francisca of Savoy twice queen consort of Portugal as the spouse of two Portuguese kings. She first became queen of Portugal at the age of 20 on the day of her marriage to Afonso Since the marriage was never consummated, she was able to obtain an annulment. On 28 March 1668, she married Afonso's brother, the Infante Peter, Duke of Beja, who was appointed prince regent the same year due to Afonso's perceived incompetence. Maria Francisca became queen of Portugal for the second time when Peter succeeded his brother as Peter II in 1683. She herself died later that year
1650 Princess Wilhelmine Ernestine of Denmark an Electress Palatine. She was the third of five daughters of King Frederick III of Denmark and Sophie Amalie of Brunswick-Lüneburg
1651 William VII Landgrave of Hesse-Kassel Landgrave of Hesse-Kassel.
1676 Anthony Collins an English philosopher, and a proponent of deism.
1703 Joseph Lieutaud a French physician.
1706 John Dollond an English optician, known for his successful optics business and his patenting and commercialization of achromatic doublets.
1710 James Short (mathematician) a Scottish mathematician, optician and telescope maker.
1712 Luc Urbain de Bouëxic comte de Guichen a French admiral who commanded the French fleets that fought the British at the First Battle of Ushant and the Battle of Martinique during the American War of Independence.
1730 Motoori Norinaga a Japanese scholar of Kokugaku active during the Edo period. He is probably the best known and most prominent of all scholars in this tradition
1736 Enoch Poor a brigadier general in the Continental Army in the American Revolutionary War. He was a ship builder and merchant from Exeter, New Hampshire
1738 Gottlieb Christoph Harless a German classical scholar and bibliographer.
1741 Prince Benedetto Duke of Chablais a prince of Savoy and Duke of Chablais. He was born in the reign of his father Charles Emmanuel III, King of Sardinia. He has no descendants but had a distinguished military career. He married his niece and was the owner of the Palazzo Chiablese in Turin
1750 Pierre-Nicolas Beauvallet a French sculptor, draftsman and printmaker.
1759 Alexander J. Dallas (statesman) an American statesman who served as the U.S. Treasury Secretary under President James Madison
1763 Pierre Paul Royer-Collard a French statesman and philosopher, leader of the Doctrinaires group during the Bourbon Restoration.
1764 Sidney Smith (Royal Navy officer) a British naval officer. Serving in the American and French revolutionary wars, he later rose to the rank of admiral. Napoleon Bonaparte, reminiscing later in his life, said of him: "That man made me miss my destiny"
1766 Emmanuel comte de Las Cases a French atlas-maker and author, famed for an admiring book on Napoleon.
1774 Daniel D. Tompkins the fourth Governor of New York , and the sixth Vice President of the United States.
1781 Siméon Denis Poisson a French mathematician, geometer, and physicist. He obtained many important results, but within the elite Académie des Sciences he also was the final leading opponent of the wave theory of light and was proven wrong on that matter by Augustin-Jean Fresnel
1782 Princess Maria Augusta of Saxony the daughter of Frederick Augustus I of Saxony and Amalie of Zweibrücken-Birkenfeld.
1785 Sylvie von Ziegesar a German woman active in the intellectual circles of Weimar Classicism. She was a friend of the painter Louise Seidler and the intellectual Pauline Gotter the subject of Goethe's poem "To Sylvie von Ziegesar"
1786 Charles Edward Horn an English composer and singer. He was born in St Martin-in-the-Fields, London to Charles Frederick Horn and his wife, Diana Dupont. He was the eldest of their seven children. His father taught him music; he also took music lessons briefly in 1808 from singer Venanzio Rauzzini in Bath, Somerset. Horn made his singing debut on 26 June 1809 with a performance in the comic opera Up All Night, or the Smuggler's Cave at Lyceum Theatre, London. Horn continued singing, including a well-received turn in 1814 as Seraskier in Stephen Storace's The Siege of Belgrade. He achieved prominence with his portrayal of Caspar in the English version of Carl Maria von Weber's Der Freischütz in 1824
1788 Princess Augusta of Bavaria the second child and eldest daughter of Maximilian I Joseph of Bavaria and Augusta Wilhelmine of Hesse-Darmstadt.
1791 Robert Napier (engineer) often called "The Father of Clyde Shipbuilding.".
1792 Ferdinand Christian Baur a German Protestant theologian and founder and leader of the Tübingen School of theology. Following Hegel's theory of dialectic, Baur argued that second century Christianity represented the synthesis of two opposing theses: Jewish Christianity and Gentile Christianity. This and the rest of Baur's work had a profound impact upon higher criticism of biblical and related texts
1794 Abbasgulu Bakikhanov an Azerbaijani writer, historian, journalist, linguist, poet and philosopher; descendant of the ruling dynasty of the Baku Khanate, nephew of the last khan of Baku. He was an officer in the Imperial Russian Army from 1820 and participated in the Russo-Persian War of 1826-1828. He later retired and settled in Quba, but traveled extensively within Russia, meeting important literary figures as Alexander Pushkin
1797 Wilhelm Küchelbecker a Russian Romantic poet and Decembrist.
1803 Timothy Abbott Conrad an American geologist and malacologist.
1805 Friedrich Curschmann a German song composer and singer.
1805 Charles Thomas Jackson an American physician and scientist who was active in medicine, chemistry, mineralogy, and geology.
1809 Wilhelm Wolff a German schoolmaster.
1809 Pascual de Gayangos y Arce a Spanish scholar and orientalist.
1809 Santiago Derqui president of Argentina from March 5, 1860 to November 5, 1861. He was featured on the 10 Australes note, which is now obsolete
1811 Carlo Matteucci an Italian physicist and neurophysiologist who was a pioneer in the study of bioelectricity.
1812 Moses Hess a German-French-Jewish philosopher and socialist, and one of the founders of Labor Zionism.
1814 Théodore Frère a French Orientalist painter.
1814 Anton Nuhn a German anatomist.
1816 Anders Sandøe Ørsted (botanist) a Danish botanist, mycologist, zoologist and marine biologist. He was the nephew of physicist H.C. Ørsted and of politician Anders Sandøe Ørsted
1817 James B. Ricketts a career officer in the United States Army, serving as a Union Army general during the Civil War.
1818 Ernest II Duke of Saxe-Coburg and Gotha the second sovereign duke of the Duchy of Saxe-Coburg and Gotha, reigning from 1844 to his death. Ernest was born in Coburg as the eldest child of Ernest III, Duke of Saxe-Coburg-Saalfeld, and his duchess, Princess Louise of Saxe-Gotha-Altenburg. Fourteen months later, his family would be joined by one brother, Prince Albert, later consort of Queen Victoria. Ernest's father became Duke of Saxe-Coburg and Gotha in 1826 through an exchange of territories
1822 Ioan Sturdza a Prince of Moldavia.