European wars of religion European wars of religion The European wars of religion were a series of religious wars waged in 16th and 17th century Europe. The wars were fought in the aftermath of the Protestant Reformation (1517), which disrupted the religious order in the Catholic countries of Europe. However, religion was not the only cause of the wars, which also included revolts, territorial ambitions, and Great Power conflicts. By the end of the Thirty Years' War (1618–1648), Catholic France was allied with the Protestant countries against the Catholic Habsburg monarchy. The wars were largely ended by the Peace of Westphalia (1648), establishing a
Hessian War Peace Congress mediated by Duke Ernest of Saxe-Gotha and which resulted in a unification and peace treaty that was sealed in April 1648, ahead of the Treaty of Westphalia itself. Before the Westphalian Peace Treaty, Cassel fought one last time against the imperial side, winning the Battle of Wevelinghoven in the Rhineland, together with other Protestant troops. Darmstadt, however, was not involved in this battle. Under the Unification Treaty between Cassel and Darmstadt, Upper Hesse was permanently divided. Darmstadt had to give up a significant part of Upper Hesse to Cassel, not least Marburg and other occupied territories, including the