
His policies sparked the Thirty Years War.
Compare Ferdinand II of Bohemia with another historical figure:
Ferdinand II's policies as King of Bohemia, including the suppression of Protestantism, led to the Defenestration of Prague. Protestant nobles threw two Catholic regents from a window, sparking the Bohemian Revolt and the Thirty Years' War.
Ferdinand II's Catholic League forces defeated the Protestant army of Frederick V at White Mountain near Prague. This victory allowed Ferdinand to reassert Habsburg control over Bohemia and enforce Catholic uniformity.
Ferdinand II issued the Edict of Restitution, which ordered the return of all church lands seized by Protestants since 1552. This radical policy alienated many German princes and prolonged the Thirty Years' War.
See how Ferdinand II of Bohemia stacks up against other historical figures