Geldern and Kleve. A County of Cleves (German: Grafschaft Kleve; Dutch: Graafschap Kleef) was first mentioned in the 11th century. Dietrich I was the first
children were: DietrichVII, Count of Cleves (1256 – 4 October 1305) Dietrich von Kleve, Prior of Xanten (born 1258) Mechtild von Kleve (1260 – 21 December
of the Marck and so to the Counts of Marck. Hagemann, Manuel. "DietrichVII. von Kleve". Internetportal Rheinische Geschichte. Retrieved 3 February 2024
his uncle William VII of Jülich, 1st Duke of Berg in the battle of Kleverhamm and became Lord of Ravenstein. When his brother Dietrich IX, Count of Mark
Grafschaft Berg. Land im Mittelpunkt der Mächte. Die Herzogtümer Jülich-Kleve-Berg, Kleve 1984, S. 63–73. Hoederath, H.T. Der Fall des Hauses Isenberg 1225/1226