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–Safavid War (1532–55)
Under the Grand Vizier Rüstem Pasha, Ottomans attempting to defeat the Shah once and for all, Suleiman embarked upon a second campaign in 1548–1549. Again, Tahmasp adopted a scorched earth policy, laying waste to Armenia. Meanwhile, the French king Francis I, enemy of the Habsburgs, and Suleiman the Magnificent were moving forward with a Franco-Ottoman alliance, formalized in 1536, that would counterbalance the Habsburg threat. In 1547, when Suleiman attacked Persia, France sent its ambassador Gabriel de Luetz, to accompany him in his campaign. Gabriel de Luetz gave military advice to Suleiman, as when he advised on artillery placement during the Siege of Van. Suleiman made gains in Tabriz, Persian ruled Armenia, secured a lasting presence in the province of Van in Eastern Anatolia, and took some forts in Georgia.