The Treaty of Constantinople, also known as the Peace of Istanbul[1][2] or the Treaty of Ferhad Pasha[3] (Turkish: Ferhat Paşa Antlaşması), was a treaty between the Ottoman Empire and the Safavid Empire ending the Ottoman–Safavid War of 1578–1590. It was signed on 21 March 1590 in Constantinople (present-day Istanbul). The war started when the Ottomans, then ruled by Murad III, invaded the Safavid possessions in Georgia, during a period of Safavid weakness.[4] With the empire beleaguered on numerous fronts and its domestic control plagued by civil wars and court intrigues, the new Safavid king Abbas I, who had been placed on the throne in 1588, opted for unconditional peace, which led to the treaty. The treaty put an end to 12 years of hostilities between the two arch rivals.[1] While both the war and the treaty were a success for the Ottomans, and severely disadvantageous for the Safavids, the new status quo proved to be short lived, as in the next bout of hostilities, several years later, all Safavid losses were recovered.