Who married Catherine de Glogów?

Margrave John V of Brandenburg-Salzwedel, nicknamed "the Illustrious" (in Latin Illustris), (1302 – 26 March 1317) was Margrave and co-ruler of Brandenburg from 1308 until his death.

His parents were Margrave Hermann, "the Tall" of Brandenburg and Anne of Austria, a daughter of Emperor Albert I, Duke of Austria and King of Bohemia. John married Catherine (d. 1327), a daughter of Duke Henry III of Glogau and Sagan.

John V died in 1317. With his death, the Brandenburg-Salzwedel line of the House of Ascania died out.

John III of Holstein-Plön (c. 1297–1359), called John the Mild, was a Count of Schauenburg and Holstein-Plön and Holstein-Kiel, ruling Holstein-Plön (1312–1316 and again 1350–1359) and Holstein-Kiel (1316–1359). Together with Count Gerhard III of Holstein-Rendsburg, John III was the lord ruling in guardianship the Danish Duchy of Schleswig 1332–1340. He was known as “John the Mild”.