Births on May 15

Maria of Austria, Duchess of Jülich-Cleves-Berg (d. 1581)

Archduchess Maria of Austria (15 May 1531 – 11 December 1581) was the daughter of Emperor Ferdinand I from the House of Habsburg and Anna of Bohemia and Hungary.

She married William, Duke of Jülich-Cleves-Berg on 18 July 1546 as his second wife. Their children were:

Marie Eleonore (1550–1608); married Albert Frederick, Duke of Prussia

Anna (1552–1632); married Philip Louis, Count Palatine of Neuburg

Magdalene (1553–1633); married John I, Count Palatine of Zweibrücken, brother of Philip Louis, Count Palatine of Neuburg

Charles Frederick (1555–1575)

Elizabeth (1556–1561)

Sibylle (1557–1627); married Karl II Habsburg (1560–1618) of Austria, Margrave of Burgau, a morganatic son of Ferdinand II, Archduke of Austria

John William (1562–1609), Bishop of Münster, Count of Altena, Duke of Jülich-Cleves-Berg; married firstly, in 1585, to Jakobea of Baden (1558–1597), daughter of Philibert, Margrave of Baden-Baden; married secondly, in 1599, to Antonia of Lorraine (1568–1610), daughter of Charles III, Duke of Lorraine)