John, Margrave of Brandenburg-Kulmbach
John, nicknamed the Alchemist (1406 – 16 November 1464) was a Margrave of Brandenburg-Kulmbach and served as the peace-loving Margrave of Brandenburg after the abdication of his father, Frederick I, the first member of the House of Hohenzollern to rule Brandenburg.
Frederick I, Elector of Brandenburg
Frederick (Middle High German: "Friderich," Standard German: "Friedrich"; 21 September 1371 – 20 September 1440) was the last Burgrave of Nuremberg from 1397 to 1427 (as Frederick VI), Margrave of Brandenburg-Ansbach from 1398, Margrave of Brandenburg-Kulmbach from 1420, and Elector of Brandenburg (as Frederick I) from 1415 until his death.
He became the first member of the House of Hohenzollern to rule the Margraviate of Brandenburg.
Sophie of Landsberg
Sophie of Landsberg( ca. 1259 – 24 August 1318) was a German princess member of the House of Wettin and by marriage Duchess of Glogów.
She was the eldest child and eldest daughter of Dietrich the Wise, Margrave of Landsberg, by his wife Helena, daughter of John I, Margrave of Brandenburg.
Albert II, Margrave of Brandenburg
Albert II, Margrave of Brandenburg( – 25 February 1220) was a member of the House of Ascania.
He was Margrave of Brandenburg from 1205 until his death in 1220.
Elisabeth of Brandenburg-Küstrin
Elizabeth of Brandenburg- Küstrin( 29 August 1540 – 8 March 1578), was a princess of Brandenburg- Küstrin and margravine of Brandenburg- Ansbach and Brandenburg- Kulmbach by marriage.
Margaret of Baden
Margaret of Baden( 1431 – 24 October 1457) was a Margravine of Baden by birth and by marriage Margravine of Brandenburg- Ansbach and Brandenburg- Kulmbach.
She was the daughter of Jacob, Margrave of Baden- Baden, and his wife Catherine of Lorraine.
In 1446, Margaret married Albert of Brandenburg, the future Albert III Achilles, Elector of Brandenburg, in Heilsbronn.
Margaret died before he succeeded to the Electorate of Brandenburg, thus never served as Electress.
Their marriage produced three sons and three daughters:
Margaret died in Ansbach in 1457 shortly after her husband acquired the Margraviate of Brandenburg- Kulmbach.
Kunigunde of Brandenburg-Kulmbach
Kunigunde of Brandenburg- Kulmbach( 1524 in Ansbach; died: 27 February 1558 in Pforzheim) was a princess of Brandenburg- Kulmbach by birth and by marriage Margravine of Baden- Durlach.
Marie of Brandenburg-Kulmbach
Marie of Brandenburg- Kulmbach( born 14 October 1519 in Ansbach – died 31 October 1567 in Heidelberg) was a Princess of Brandenburg- Kulmbach and by marriage Electress Palatine.
Casimir, Margrave of Brandenburg-Bayreuth
Casimir( or Kasimir) of Brandenburg- Bayreuth( 27 December 1481 – 21 September 1527) was Margrave of Bayreuth or Margrave of Brandenburg- Kulmbach from 1515 to 1527.
Christian, Margrave of Brandenburg-Bayreuth
Christian, Margrave of Brandenburg- Bayreuth( 30 January 1581 in Cölln – 30 May 1655 in Bayreuth) was a member of the House of Hohenzollern and Margrave of Brandenburg- Kulmbach( later renamed" Brandenburg- Bayreuth").
He was the eldest of eleven children born to John George, Elector of Brandenburg by his third wife Princess Elisabeth of Anhalt- Zerbst.

Question: What nationality is John, Margrave Of Brandenburg-Kulmbach's father?