Other Protestants supported the opinion of the Catholics . So , in 1617 , Ferdinand was elected by the Bohemian Estates to become the Crown Prince , and automatically upon the death of Matthias , the next King of Bohemia . However , other Protestants supported the stance taken by the Catholics , and in 1617 , Ferdinand was duly elected by the Bohemian estates to become the Crown Prince , and automatically upon the death of Matthias , the next King of Bohemia .