An act of rebellion by Bohemian Protestant nobles against Catholic Habsburg rule. The Defenestration of Prague was the ejection of two imperial representatives and a Secretary from a window of the Hradčany Castle in Prague. It precipitated the beginning of the Thirty Years War and, following the Habsburg victory at the Battle of White Mountain (1620), near Prague, the city underwent enforced Catholicization and Germanization. In 1635, during the Thirty Years War, the Peace of Prague reconciled the German princes to the emperor.