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.
Ottoman wars in Asia
After the death of Uzun Hasan of Akkoyunlu, Ismail I of Safavid house began controlling Persia and East Anatolia. Sect differences between the two countries led to a war. In 1514 Selim I defeated Persian army in the Battle of Chaldiran and annexed most of East Anatolia. War continued during the reign of Suleyman I (the Magnificent) . Three of Suleyman’s campaigns were directed to Persia. (1534–35, 1548–49, 1553–55) The war ended by the Treaty of Amasya in 1555. Whole East Anatolia as well as mid and north Iraq became parts of the Ottoman Empire. Meanwhile, south Iraq fell voluntarily to Ottoman suzerainty. Ottomans annexed most of West Iran and Caucasus by the Treaty of Ferhat Pasha at the end of the renewed war of 1578-1590 during the reign of Murad III. But, after the attack of Shah Abbas of Persia, they had to abandon their 1590-gains by the Treaty of Nasuh Pasha in 1612 during the reign of Ahmed I. In 1623, Persians also captured Baghdad in mid Iraq, but Murad IV recaptured the city in 1639. At the end of the war the present western borderline of Iran was drawn by the Treaty of Zuhab.