Born in 1566

Apr 2 Magdalena de Pazzi an Italian Carmelite mystic and saint of the Roman Catholic Church.
May 26 Mehmed III sultan of the Ottoman Empire from 1595 until his death.
Jun 19 James VI and I King of Scotland as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the Scottish and English crowns on 24 March 1603 until his death. The kingdoms of Scotland and England were individual sovereign states, with their own parliaments, judiciary, and laws, though both were ruled by James in personal union
Jun 20 Sigismund III Vasa King of Poland and Grand Duke of Lithuania, a monarch of the united Polish–Lithuanian Commonwealth from 1587 to 1632, and King of Sweden from 1592 until he was deposed in 1599. He was the son of King John III of Sweden and his first wife, Catherine Jagellonica of Poland
Jul 9 John Ernest Duke of Saxe-Eisenach a duke of Saxe-Eisenach and later of Saxe-Coburg.
Aug 12 Isabella Clara Eugenia sovereign of the Spanish Netherlands in the Low Countries and the north of modern France, together with her husband Albert. In some sources, she is referred to as Clara Isabella Eugenia. By birth, she was an infanta of Spain and Portugal
Sep 1 Edward Alleyn an English actor who was a major figure of the Elizabethan theatre and founder of Dulwich College and Alleyn's School.
Oct 13 Richard Boyle 1st Earl of Cork Lord Treasurer of the Kingdom of Ireland.
Nov 3 Charles Count of Soissons a French prince du sang and military commander during the struggles over religion and the throne in late 16th century France. A first cousin of King Henry IV of France, he was the son of the Huguenot leader Louis I de Bourbon, prince de Condé and his second wife, Françoise d'Orléans-Longueville. He gave his name to the Hotel de Soissons after his title Count of Soissons
Nov 16 Anna Juliana Gonzaga an Archduchess of Austria who became a Religious Sister of the Servite Order after the death of her husband, the Archduke Ferdinand II of Austria. The cause for her canonization was opened but to date has not advanced
Nov 26 Francesco Bracciolini an Italian poet.
Dec 11 Manuel Cardoso a Portuguese composer and organist. With Duarte Lobo and John IV of Portugal, he represented the "golden age" of Portuguese polyphony