Biography of Ferdinand I
Ferdinand I (10 March 1503, Alcalá de Henares, Spain – 25 July 1564, Vienna, Habsburg domain [now in Austria]) was Holy Roman Emperor from 1558, king of Bohemia and Hungary from 1526, and king of Croatia from 1527 until his death. Before his accession, he ruled the Austrian hereditary lands of the Habsburgs in the name of his elder brother, Charles V, Holy Roman Emperor.
The key events during his reign were the contest with the Ottoman Empire, whose great advance into Central Europe began in the 1520s, and the Protestant Reformation, which resulted in several wars of religion.
Ferdinand's motto was Fiat iustitia, et pereat mundus: "Let justice be done, though the world perish".