Germany: Ferdinand I (1503-1564), 31st Holy Roman emperor, by Barthel Beham (1502-1540), c. 1531.

Ferdinand I (1503-1564) was the son of Philip I of Castile and Queen Joanna I of Castile, grandson of Emperor Maximilian I and younger brother of future emperor Charles V. Ferdinand became King of Bohemia and Hungary in 1526 after the death of his brother-in-law Louis II, and served as his brother Charles' deputy in the Holy Roman Empire during his numerous absences, eventually being crowned as King of Germany in 1531. When Charles V abdicated in 1556, Ferdinand was elected as his successor to the imperial throne, becoming Holy Roman emperor in 1558.