Ottoman–Persian Wars

The Ottoman–Persian Wars were a series of conflicts between the Ottoman Empire (present-day Turkey) and the Persian states that ruled Iran—specifically the Safavids, Afsharids, and Qajars. The conflicts began in the early 16th century and continued into the 19th century, punctuated by truces and lengthy peace agreements.

The main theaters of war were eastern Anatolia, Mesopotamia (particularly Baghdad and Basra), Kurdistan, the Caucasus (Armenia, Georgia, Azerbaijan), and Shirvan. Both sides competed for control of trade routes, tax revenues, and dominion over border regions. Religious difference also played a role: the Sunni Ottomans and the Safavids, who promoted Twelver Shi'ism, each used sectarian appeal to strengthen military recruitment and the legitimacy of their war efforts.

Early period and the Safavid era

Open conflict began when Shah Ismail I established the Safavid state and made Shi'ism the official religion. The Battle of Chaldiran (1514) ended in victory for Sultan Selim I, giving the Ottomans control of eastern Anatolia and part of the Diyarbakır region. A key factor was Ottoman use of gunpowder artillery and firearms, while Safavid forces relied on Qizilbash cavalry. Under Sultan Suleiman, the Ottomans took Tabriz and Baghdad in 1534; the Peace of Amasya (1555) was the first peace treaty to establish recognized borders.

17th century: Abbas I and border agreements

Shah Abbas I reorganized the Persian army, introducing gunpowder weapons and standing forces. He recovered Tabriz, Baghdad, and Caucasian territories. Subsequent wars ended with the Treaty of Zuhab (Qasr-e Shirin, 1639), which left Mesopotamia in Ottoman hands while the eastern Caucasus remained Persian. This treaty formed the basis of the Turkish–Iranian border that exists today and ushered in a period of relative peace lasting nearly a century.

18th and 19th centuries

The collapse of the Safavids in 1722 opened a new period in which the Ottomans and Russians divided western Iranian territories. Nader Shah recovered these lands and fought several wars with the Ottomans, after which the Treaty of Zuhab was reaffirmed in 1746. In the 19th century, the Qajars and Ottomans warred in 1821–1823, ending with the Treaty of Erzurum. Borders were further confirmed by other agreements later in the century, often with British and Russian mediation.

Consequences

These conflicts deepened the Sunni–Shi'i sectarian division of the Middle East and caused population displacement and economic destruction in border regions. They also accelerated military and administrative changes in both empires, particularly the adoption of gunpowder weapon technology. The border established by the Treaty of Zuhab remains evident in the boundaries of Turkey, Iraq, and Iran today.