Eberhard I of the Marck-Arenberg

Eberhard I of the Marck-Arenberg (c. 1305–1387), a younger son of Count Engelbert II of the Mark, was first trained as a cleric. He studied canon law at Orléans and in 1339 became provost of Münster Cathedral, later a canon and cantor at Cologne.

In 1351 he left the Church to marry Maria of Looz, through whom he gained Peer and Neufchâteau in the Ardennes, and inherited Arenberg from his mother, founding the Mark-Arenberg line.