In 1241, the Mongol Empire invaded the country, causing the Hungarian king Béla IV to flee and approximately 500,000 Hungarians were killed, along with with heavy damage. In 1301, the Árpád-house died out. Later on, kings from various houses ruled over Hungary. The greatest of them is Matthias Corvinus, famous for taking Austrian terrirories like Vienna, etc. and protecting the country against Ottoman aggression. However, some decades after he had died (1490), the Ottoman Sultan Suleiman the Magnificent defeated the Hungarian king in the Battle of Mohács (1526). The Kingdom was cut up into three parts: the western and northern areas remained Hungary, the southern region fell under Ottoman rule, and the eastern part became an Ottoman vassal as the Principality of Transylvania.