France signed a military alliance with the Ottoman Empire in 1536. The agreement joined Francis I of France with Sultan Suleiman I, better known as Suleiman the Magnificent, against their shared Habsburg rival, Emperor Charles V.
The partnership developed after Francis I was defeated and captured at the Battle of Pavia in 1525. France needed a powerful ally capable of pressuring Habsburg territories from the Mediterranean, while the Ottoman Empire sought to weaken Habsburg influence in central Europe and the western Mediterranean. Diplomatic exchanges eventually produced formal agreements negotiated by the French ambassador Jean de La Forêt.
The alliance was unusual and controversial because Catholic France cooperated with a Muslim empire. Critics in Europe called it an “unnatural” or “sacrilegious” alliance, but early-modern diplomacy was driven largely by strategic interests. Ottoman naval forces supported French operations in the Italian Wars, and French merchants received important commercial privileges in Ottoman ports.
The partnership continued intermittently for more than two centuries. It reached a military high point during the 1553 invasion of Corsica and finally faded during Napoleon’s campaign in Ottoman Egypt from 1798 to 1801.