Eberhard I, Count of the Mark

Eberhard I von der Mark (c.1255–4 July 1308) became count in 1277, after his father Engelbert I, abducted by Count Herman of Lohn, died imprisoned at Bredevoort; in 1278 Eberhard stormed the castle in revenge.

From 1281 he allied with neighbouring counts against the Archbishops of Cologne and fought at Worringen in 1288, where victory freed the County of Mark from Cologne's overlordship. By his wife Irmgard of Berg he fathered his successor, Engelbert II.