Who married Eberhard I, Count of the Mark?

Eberhard I (c. 1255–4 July 1308) was a German nobleman. He was Count of the Mark from 1277 until his death. He was the son of Engelbert I, Count of the Mark and Kunigunde of Blieskastel (died 1265), daughter of Count Henry I of Blieskastel.

In 1277, Count Herman of Lohn abducted Eberhard's father Engelbert I, Count of the Mark near Tecklenburg and imprisoned him in the Castle of Bredevoort, where he later died. In 1278 Eberhard took revenge and conquered the castle.

From 1281, Eberhard formed an alliance with the Counts of Berg, Cleve and Jülich against the Electorate of Cologne and gained the independence of the County of Mark from the Archbishop of Cologne after the victory in the Battle of Worringen in 1288. He also obtained Brakel, Westhofen and Waltrop. Eberhard died 4 July 1308 and was buried in Fröndenberg Monastery.