Who married Jobst I, Count of Holstein-Schauenburg?

Jobst I, Count of Holstein-Schauenburg (1483-1531) was a German nobleman. He was the ruling Count of Schauenburg and Holstein-Pinneberg from 1527 until his death. He was a son of John IV (1449 – 30 March 1527) and his wife, Cordula of Gemen (d. 30 May 1528).

Countess Mary of Nassau-Siegen (February 1491 – 1547), German: Maria Gräfin von Nassau-Siegen, official titles: Gräfin zu Nassau, Vianden und Diez, was a countess from the House of Nassau-Siegen, a cadet branch of the Ottonian Line of the House of Nassau, and through marriage Countess of Holstein-Schauenburg-Pinneberg.