These events caused Causation widespread fears throughout northern and central Europe , and triggered Causation the Protestant Bohemians living in the then relatively loose dominion of Habsburg Austria ( and also with the Holy Roman Empire ) to revolt Change_of_leadership against their nominal ruler , Ferdinand II .

The Protestant Bohemians ousted Change_of_leadership the Habsburgs and elected Choosing the Calvinist Frederick V , Elector of the Rhenish Palatinate as the new king of the Kingdom of Bohemia .

However , Matthias seized Hold his brother at the request Request of the Protestant Bohemians , only releasing Releasing him once he abdicated Change_of_leadership his Bohemian crown to Matthias .

The Bohemians were friendless , against a powerful monarch of Europe who had many and powerful allies , and who was a scion of one of the most powerful dynasties in Europe who stood Placing to inherit the entirety of the Emperor 's dominions .

The Bohemians made Manufacturing offers to the Duke of Savoy , Elector of Saxony ( the preferred candidate ) and even to the Prince of Transylvania .

The Elector of Saxony 's refusal Agree_or_refuse_to_act of the Bohemian crown made Manufacturing the Elector Palatine the most senior Protestant available to the Bohemians .