Magdalene of Brandenburg (1412–1454)
Magdalene of Brandenburg( born:; died: 27 October 1454 in Scharnebeck) was a princess of Brandenburg by birth and by marriage Duchess of Brunswick- Lüneburg.
Joachim II Hector, Elector of Brandenburg
Joachim II (or "Hektor"; 13 January 1505 – 3 January 1571) was a Prince-elector of the Margraviate of Brandenburg (1535–1571), the sixth member of the House of Hohenzollern.
Joachim II was the eldest son of Joachim I Nestor, Elector of Brandenburg and his wife Elizabeth of Denmark, Norway, and Sweden.
He received the cognomen Hector after the Trojan prince and warrior for his qualities and prowess.
Barbara of Brandenburg (1464–1515)
Barbara of Brandenburg( 30 May 1464 – 4 September 1515), a member of the German House of Hohenzollern, was by birth Margravine of Brandenburg, and by her two marriages, Duchess of Głogów from 1472 to 1476, and Queen of Bohemia from 1476 to 1490/1500.
Cecilia of Brandenburg
Cecilia of Brandenburg( – 4 January 1449) was a princess of Brandenburg by birth and by marriage a Duchess of Brunswick- Wolfenbüttel.
Barbara of Brandenburg, Duchess of Brieg
Barbara of Brandenburg (10 August 1527 – Brzeg, 2 January 1595), was a German princess member of the House of Hohenzollern
She was a Margravine of Brandenburg by birth and by marriage a Duchess of Brieg (Brzeg).
She was the second child but eldest daughter of Joachim II Hector, Elector of Brandenburg, by his first wife Magdalena, daughter of George, Duke of Saxony.
Sibylle of Brandenburg
Sibylle of Brandenburg( 31 May 1467 in Ansbach – 9 July 1524 in Kaster) was a Princess of Brandenburg by birth and by marriage Duchess of Jülich and Duchess of Berg.
Margaret of Brandenburg (1450–1489)
Margaret of Brandenburg( 1449 or 1450 – 1489) was a princess of Brandenburg by birth and by marriage Duchess of Pomerania.
Elisabeth of Brandenburg, Duchess of Pomerania
Elizabeth of Brandenburg( 1425 – after 13 January 1465) was a princess of Brandenburg by birth and marriage Duchess of Pomerania.
Barbara of Brandenburg-Ansbach-Kulmbach
Barbara of Brandenburg- Ansbach- Kulmbach( 24 September 1495 in Ansbach – 23 September 1552 in Karlovy Vary) was a princess of Brandenburg- Ansbach by birth and marriage Landgravine of Leuchtenberg.
Dorothea of Brandenburg, Duchess of Saxe-Lauenburg
Dorothea of Brandenburg( 1446 – March 1519) was a princess of Brandenburg by birth and by marriage Duchess of Saxe- Lauenburg.

Question: What nationality is Barbara Of Brandenburg, Duchess Of Brieg's father?
Answer: Margraviate of Brandenburg