- A fragmented empire centered in modern-day Austria andHungary, controlled by the Hapsburg family.- Through alliances of marriage, the empire included Germany,Bohemia, Switzerland, and northern Italy.- The empire declined as the result of invasions by the Ottoman Turks and the Thirty Years' War (1618-1648).- The Ottoman Turks, threatened by the strength of the Christian empire, conquered Hungary in 1526.- Following the peace negotiated at the end of the Thirty Years' War, the empire was significantly reduced and lasted, with no real power, until 1806.

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