On 14 February 1479, at
Frankfurt (Oder), Frederick I was married to Princess
Sophia of Poland (6 April 1464 – 5 October 1512), daughter of King
Casimir IV of Poland by his wife
Elisabeth of Austria, and sister of King
Sigismund I of Poland. They had seventeen children: •
Casimir, Margrave of Brandenburg-Kulmbach (27 September 1481, Ansbach – 21 September 1527,
Buda). • Elisabeth, died young. • Margarete of Brandenburg-Ansbach-Kulmbach (10 January 1483, Ansbach – 10 July 1532). •
George, Margrave of Brandenburg-Ansbach (4 March 1484, Ansbach – 27 December 1543, Ansbach). •
Sophie of Brandenburg-Ansbach-Kulmbach (10 March 1485, Ansbach – 24 May 1537,
Liegnitz), married on 14 November 1518 to Duke
Frederick II of Legnica. • Anna of Brandenburg-Ansbach-Kulmbach (5 May 1487, Ansbach – 7 February 1539), married on 1 December 1518 to Duke
Wenceslaus II of Cieszyn. • Barbara, died young. •
Albert, 1st Duke of Prussia (17 May 1490, Ansbach – 20 March 1568, Castle
Tapiau), Grand Master of the
Teutonic Order from 1511 to 1525, and first
Duke of Prussia from 1525. • Frederick of Brandenburg-Ansbach-Kulmbach (13 June 1491, Ansbach – ca. 1497). •
Johann, Viceroy of Valencia (9 January 1493,
Plassenburg – 5 July 1525,
Valencia) •
Elisabeth of Brandenburg-Ansbach-Kulmbach (25 March 1494, Ansbach – 31 May 1518,
Pforzheim), married in Pforzheim on 29 September 1510 to Margrave
Ernest of Baden-Durlach. •
Barbara of Brandenburg-Ansbach-Kulmbach (24 September 1495, Ansbach – 23 September 1552), married in
Plassenburg on 26 July 1528 to Landgrave
George III of Leuchtenberg. • Frederick of Brandenburg-Ansbach-Kulmbach (17 January 1497, Ansbach – 20 August 1536,
Genoa), a canon in
Würzburg and
Salzburg. •
Wilhelm, Archbishop of Riga (30 June 1498, Ansbach – 4 February 1563,
Riga) •
John Albert, Archbishop of Magdeburg (20 September 1499, Ansbach – 17 May 1550,
Halle) • Frederick Albert, died young. • Gumprecht of Brandenburg-Ansbach-Kulmbach (16 July 1503, Ansbach – 25 June 1528,
Naples), a canon in
Bamberg. ==Ancestry==