The Battle of Marj Rahit (Arabic: معركة/يوم مرج راهط, Yawm Marj Rāhiṭ) was one of the early battles of the Second Fitna. It was fought on 18 August 684 between the Kalb-dominated armies of the Yaman tribal confederation, supporting the Umayyads under Caliph Marwan I, and the Qays under al-Dahhak ibn Qays al-Fihri, who supported the Mecca-based Abdallah ibn al-Zubayr; the latter had proclaimed himself Caliph. The Kalbi victory consolidated the position of the Umayyads over Bilad al-Sham (the Islamic Levant), paving the way for their eventual victory in the war against Ibn al-Zubayr. However, it also left a bitter legacy of division and rivalry between the Qays and the Yaman, which would be a constant source of strife and instability for the remainder of the Umayyad Caliphate.