Frederick III

noun

1415–93, emperor of the Holy Roman Empire 1452–93; as Frederick IV, king of Germany 1440–93.
the Wise,1463–1525, elector of Saxony 1486–1525: protector of Martin Luther.

British Dictionary definitions for frederick iii

Frederick III

noun

1415–93, Holy Roman Emperor (1452–93) and, as Frederick IV, king of Germany (1440–93)
called the Wise . 1463–1525, elector of Saxony (1486–1525). He protected Martin Luther in Wartburg Castle after the Diet of Worms (1521)