Arnold IV, Count of Loon

In 1234, he took part in a crusade at the request of Pope Gregory IX against the Statingers, heretics, probably Cathar, located in the diocese of Bremen.

Then he helped Jean d'Eppes, bishop of Liege in repelling attacks Waleran, Lord of Valkenburg, in 1238.

The following year he reconciles Henry II, Duke of Brabant and Wautier Bertout, Lord of Mechelen.

In 1240, he joined forces with the dukes of Brabant and Limburg an attempt to reconcile Pope Gregory IX with the Emperor Frederick II.

To keep their fiefdoms from suffering the disorders of anarchy following the death of Frederick II, Bishop of Liege, the Duke of Brabant, and Count of Gelderland entered a confederation entrusted with their common defense.