of the Kingdom of Hungary. The territory along with Ottoman Hungary suffered greatly from the nearly constant wars taking place. Ottoman Hungary: The Great Alföld (i.e. most of present-day Hungary, including south-eastern Transdanubia and the Banat), partly without north-eastern present-day Hungary. Eastern Hungarian Kingdom under the Szapolyai. Note that this territory, often under Ottoman influence, was different from Transylvania proper and included various other territories sometimes referred to as Partium. Later the entity was called Principality of Transylvania. On 29 February 1528, King John I of Hungary received the support of the Ottoman Sultan. A three-sided conflict ensued as Ferdinand moved to assert his rule over as much of the Hungarian kingdom as he could. By 1529 the kingdom had been split into two parts: Habsburg Hungary and the "eastern-Kingdom of Hungary". At this time there were no Ottomans on Hungarian territories, except Srem's important castles. In 1532, Nikola Jurišić defended Kőszeg and stopped a powerful Ottoman army. By 1541, the fall of Buda marked a further division of Hungary into three areas. The country remained divided until the end of the 17th century. On 1 May 1566, Suleiman I led an Ottoman invasion of Habsburg-controlled Hungary, the Ottoman forces of which was one of the most sizable armies he had led in his rule of 46 years. After reaching Belgrade and met with John II Sigismund Zápolya on 27 June, Suleiman I learned that a Croatian-Hungarian nobleman, Nikola IV Zrinski, Ban of Croatia, accomplished an attack on an Ottoman military camp at Siklós. Suleiman I held off his attack of Eger for the time being, and began to set off towards Nikola IV Zrinski's fortress at Szigetvár. From 2 August to 7 September, the Ottoman forces had laid siege to the fortress with a force, at the least, of 150,000 against Zrinski's 2,300 defenders. While the siege turned into a victory for the Ottomans, it came at the cost of: 25,000 Ottoman soldiers and Suleiman I, who before the final battle of Szigetvár, due to natural causes of old age and illness. In the following centuries there were numerous attempts to push back the Ottoman forces, such as the Long War or Thirteen Years' War (29 July 1593 – 1604/11 November 1606) led by a coalition of Christian forces. In 1644 the Winter Campaign by Miklós Zrínyi burnt the crucial Suleiman Bridge of Osijek in eastern Slavonia, interrupting a