Full Name: Albrecht von Hohenzollern
Profession: Duke of Prussia
Biography: The last Grand Master of the Teutonic Knights, who after converting to Lutheranism, became the first monarch of the Duchy of Prussia, the secularized state that emerged from the former Monastic State of the Teutonic Knights.
The first European ruler to establish Protestantism as the official state religion of his lands. He proved instrumental in the political spread of Protestantism in its early stage, ruling the Prussian lands for nearly six decades.
- 1525-02-10 Albert of Prussia pledges a personal oath to Sigismund I and is invested with the duchy for himself and his heirs