Ottoman–Safavid relations
The history of Ottoman–Safavid relations (Persian: روابط عثمانی و صفوی) started with the establishment of the Safavid Empire in Iran (Persia) in the early 16th century. The initial Ottoman–Safavid conflict culminated in the Battle of Chaldiran in 1514, and was followed by a century of border confrontation.
Source: Wikipedia — Ottoman–Safavid relations (CC BY-SA 4.0)