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.
Heraclius I of Kakheti
In 1675, Archil conflicted with the shah's government, abandoned Kakheti and defected to the Ottoman Empire. Prince Nicholas capitalized on the ensuing turmoil, returned for a second time and was proclaimed as King of Kakheti Heraclius (Erekle) I. Earlier, in 1666, shah Suleiman I had succeeded Abbas II on the Iranian Safavid throne. In 1674, Suleiman I asked him to decisively end his stay in Russia, ordered him to Isfahan and promised to confirm him as king if Heraclius apostatized to Islam. The king refused to become Muslim and the shah's subject, citing the oath of allegiance given by his ancestor, Alexander II of Kakheti (r. 1574–1605), to Feodor I of Russia. Hence, he was deprived of the crown, being allowed, however, to settle to Isfahan. Kakheti was subsequently under direct Safavid rule.