Classical Age of the Ottoman Empire
Expansion continued during the first half of the reign of Suleiman I (r. 1520-1566), who conquered first Belgrade (1521) and Rhodes, before invading Hungary in 1526, defeating and killing King Louis II in the Battle of Mohács and briefly occupying Buda. Lacking a king, Hungary descended into civil war over the succession, and the Ottomans gave support to John Zápolya as a vassal prince. When their rivals the Habsburgs began to achieve the upper hand, Suleiman directly intervened by again conquering Buda and annexing it to the empire in 1541. Elsewhere, Suleiman led major campaigns against Safavid Iran, conquering Baghdad in 1534 and annexing Iraq. Ottoman rule was further extended with the incorporation of much of North Africa, the conquest of coastal Yemen in 1538, and the subsequent annexation of the interior.
Suleiman the Magnificent
On 6 September 1566, Suleiman, who had set out from Constantinople to command an expedition to Hungary, died before an Ottoman victory at the Battle of Szigetvár in Hungary and the Grand Vizier kept his death secret during the retreat for the enthronement of Selim II. Just the night before the sickly sultan died in his tent, two months before he would have turned 72. The sultan's body was taken back to Istanbul to be buried, while his heart, liver, and some other organs were buried in Turbék, outside Szigetvár. A mausoleum was constructed above the burial site, and came to be regarded as a holy place and pilgrimage site. Within a decade a mosque and Sufi hospice were built near it, and the site was protected by a salaried garrison of several dozen men.