sentences:  In 1526, the Hungarian parliament elected two separate kings János Szapolyai and Ferdinand I Habsburg, but the choice of the Croatian sabor at Cetin prevailed on the side of Ferdinand I, as they elected him as the new king of Croatia on 1 January 1527, uniting both lands under Habsburg rule.In return they were promised the historic rights, freedoms, laws and defence of Croatian Kingdom.However, the Hungarian-Croatian Kingdom was not enough well prepared and organized and the Ottoman Empire expanded further in the 16th century to include most of Slavonia, western Bosnia and Lika.