Deutsch: Ferdinand I. war Kaiser des Heiligen Römischen Reichs (1556–1564).
English: HM Ferdinand I (10 March 1503 – 25 July 1564) was an Austrian monarch from the House of Habsburg. He was first the Archduke of Austria from 1521-1564. After the death of Louis II, Ferdinand ruled as King of Bohemia and Hungary (1526–1564). After his brother Charles V abdicated as Holy Roman Emperor in 1556, Ferdinand reigned as emperor (formally beginning in 1558) until his death.