Georg Friedrich I. von Brandenburg-Ansbach-Kulmbach, Markgraf von Brandenburg-Ansbach, Herzog von Jägerndorf, Markgraf von Brandenburg-Kulmbach, Herzog von Preußen, was born 5 April 1539 in Ansbach, Bavaria, Germany to Georg der Fromme von Brandenburg-Ansbach-Kulmbach (1484-1543) and Aemilia von Sachsen (1516-1591) and died 25 April 1603 Ansbach, Bavaria, Germany of unspecified causes. He married Elisabeth von Brandenburg-Küstrin (1540-1578) 26 December 1558 JL in Küstrin, Brandenburg, Germany. He married Sofie von Braunschweig-Lüneburg (1563-1639) 3 May 1579 JL in Dresden, Saxony, Germany. Charlemagne (747-814)/s, Henry II of England (1133-1189)/s, Hugh Capet (c940-996)/s.
George Frederick reigned in his native Ansbach, Franconia and Jägerndorf, Upper Silesia since 1556 and, after the death of his cousin Albert Alcibiades in 1557, also in Kulmbach. He took over the administration of the Duchy of Prussia in 1577, when the then-reigning Duke Albert Frederick became ill.
He was the last of the older Franconia line of the House of Hohenzollern. Upon his death Ansbach and Kulmbach were inherited by younger princes of the Brandenburg line according to the House Treaty of Gera of 1598.
George Frederick rebuilt the palace and fortress Plassenburg, which was destroyed after the second margravian war (1552–1554), as one of the most impressive residences of the renaissance in the German empire. He also built the fortress Wülzburg and the old palace in Bayreuth.
During his reign between 1557 and 1603 in the Franconian territories of the Hohenzollern (Brandenburg-Ansbach and Brandenburg-Kulmbach) he kept peace, rebuilt cities and Castles, founded several schools and a University.
Georg Friedrich I. von Brandenburg-Ansbach-Kulmbach (1539-1603)Born: 5 April 1539 Died: 25 April 1603
| Margrave of Brandenburg-Ansbach
| Margrave of Brandenburg-Kulmbach
| Regent of Prussia