Safavid Empire
In the reign of Tahmasb I, Suleiman the Magnificent (r. 1520–1566), sultan of the Ottoman Empire, may have considered a strong Safavid empire a threat to his ambitious plans in the west and northwest of his realm. During the first decade of Tahmasp's reign, however, he was preoccupied with fighting the Habsburgs and the unsuccessful attempt to seize Vienna. In 1532, while the Ottomans were fighting in Hungary, Suleiman sent Olama Beg Takkalu with 50,000 troops under Fil Pasha to Iran. The Ottomans seized Tabriz and Kurdistan, and tried to obtain support from Gilan province. Tahmasp drove the Ottomans out, but news of another Uzbek invasion prevented him from defeating them. Suleiman sent his grand vizier, Ibrahim Pasha, to occupy Tabriz in July 1534 and joined him two months later. Suleiman peacefully conquered Baghdad and Shia cities such as Najaf. Whilst the Ottomans were on the march, Tahmasp was in Balkh, campaigning against the Uzbeks. Tahmasp did not fight the exhausted Ottoman army but laid waste the entire region from Tabriz to the frontier; the Ottomans could not permanently occupy the captured lands, since they soon ran out of supplies. Tahmasp established a new polity for the Safavid state; he decreased the Qizilbash influence on the Iranian bureaucracy.