Who married Anna of Anhalt-Zerbst?

John V, Count of Oldenburg and Delmenhorst (also counted as John XIV, including also non-ruling namesake siblings; 1460, Oldenburg – 10 February 1526, Oldenburg) was a member of the House of Oldenburg. He was the ruling Count of Oldenburg from 1500 to 1526. His parents were Gerhard VI, Count of Oldenburg and Adelheid of Tecklenburg.