| rdfs:comment | - In 1428, while the Ottoman Empire was fighting a war with the Republic of Venice, the Ottomans and the Kingdom of Hungary achieved a temporary peace by establishing the Serbian Despotate as a buffer state. After the war ended in 1430, the Ottomans returned to their earlier policy of controlling all lands south of the Danube. In 1432, Sultan Murad II began raiding into Transylvania. After King Sigismund died in 1437, the attacks intensified, with the Ottomans occupying Borač in 1438 and Zvornik and Srebrenica in 1439. At the end of 1439, Smederevo capitulated and Murad succeeded in making Serbia an Ottoman province. Đurađ Branković, Despot of Serbia, fled to his estates in Hungary. In 1440, Murad besieged Hungary's main border fortress, Belgrade. After failing to take the fortress, he was f
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| abstract | - In 1428, while the Ottoman Empire was fighting a war with the Republic of Venice, the Ottomans and the Kingdom of Hungary achieved a temporary peace by establishing the Serbian Despotate as a buffer state. After the war ended in 1430, the Ottomans returned to their earlier policy of controlling all lands south of the Danube. In 1432, Sultan Murad II began raiding into Transylvania. After King Sigismund died in 1437, the attacks intensified, with the Ottomans occupying Borač in 1438 and Zvornik and Srebrenica in 1439. At the end of 1439, Smederevo capitulated and Murad succeeded in making Serbia an Ottoman province. Đurađ Branković, Despot of Serbia, fled to his estates in Hungary. In 1440, Murad besieged Hungary's main border fortress, Belgrade. After failing to take the fortress, he was forced to return to Anatolia to stop attacks by the Karamanids. Meanwhile, Sigismund's successor Albert had died in October 1439, shortly after signing a law to "restore the ancient laws and customs of the realm". The law restricted the royal authority by requiring the participation of landed nobility in political decisions. Four months after Albert's death, his only son, Ladislaus, was born while Hungary was in the midst of a civil war over the next monarch. On July 17, 1440, Vladislaus, king of Poland, was crowned despite continuing disputes. John Hunyadi aided Vladislaus's cause by pacifying the eastern counties, gaining him the position of Voivode of Transylvania and the corresponding responsibility of protecting Hungary's southern border. By the end of 1442, Vladislaus had secured his status in Hungary, and denied an Ottoman proposal of peace in exchange for Belgrade. The Roman Catholic Church, meanwhile, had long been advocating for a crusade against the Ottomans, and with the end of both the Hungarian civil war and a nearly simultaneous one in Byzantium, they were able to realistically begin negotiations and planning. The impetus required to turn the plans into action was provided by Hunyadi between 1441–42. In 1441, he defeated a raid led by Ishak Pasha of Smederevo. He nearly annihilated Mezid Bey's army in Transylvania on March 22, 1442, and in September he defeated the revenge attack of Şihabeddin Pasha, governor-general of Rumelia. Branković, hoping to liberate Serbia, also lent his support after Novo Brdo, the last major Serbian city, fell to the Ottomans in 1441.
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