Murad IV (; July 26/27, 1612 – February 8, 1640) was the Sultan of the Ottoman Empire from 1623 to 1640, known both for restoring the authority of the state and for the brutality of his methods. Murad IV was born in Constantinople, the son of Sultan Ahmed I (1603–17) and the ethnic Greek Valide Kösem Sultan (1589-1651). Brought to power by a palace conspiracy in 1623, he succeeded his uncle Mustafa I (r. 1617–18, 1622–23). He was only 11 when he took the throne. His reign is most notable for the Ottoman–Safavid War (1623–39), of which the outcome would permanently part the Caucasus between the two Imperial powers for around two centuries, while it also roughly laid the foundation for the current Turkey - Iran - Iraq borders.