Battle of Marj Ardabil: The Khazars annihilate an Umayyad army and kill its commander, al-Jarrah ibn Abdallah al-Hakami.

The Battle of Marj Ardabil or the Battle of Ardabil was fought on the plains surrounding the city of Ardabil in northwestern Iran in AD 730. A Khazar army led by Barjik, the son of the Khazar khagan, invaded the Umayyad provinces of Jibal and Iranian Azerbaijan in retaliation for Caliphate attacks on Khazaria during the course of the decades-long Khazar-Arab War of the early 8th century.

The Khazars were a nomadic Turkic people who, in the late 6th century CE, established a major commercial empire covering the southeastern section of modern European Russia, southern Ukraine, Crimea, and Kazakhstan. They created what, for its duration, was the most powerful polity to emerge from the break-up of the Western Turkic Khaganate. Astride a major artery of commerce between Eastern Europe and Southwestern Asia, Khazaria became one of the foremost trading empires of the early medieval world, commanding the western marches of the Silk Road and playing a key commercial role as a crossroad between China, the Middle East, and Kievan Rus'. For some three centuries, the Khazars dominated the vast area extending from the Volga-Don steppes to the eastern Crimea and the northern Caucasus.

The Umayyad Caliphate or Umayyad Empire was the second caliphate established after the death of the Islamic prophet Muhammad and was ruled by the Umayyad dynasty. Uthman ibn Affan, the third of the Rashidun caliphs, was also a member of the clan. The family established dynastic, hereditary rule with Mu'awiya I, the long-time governor of Greater Syria, who became caliph after the end of the First Fitna in 661. After Mu'awiya's death in 680, conflicts over the succession resulted in the Second Fitna, and power eventually fell to Marwan I, from another branch of the clan. Syria remained the Umayyads' main power base thereafter, with Damascus as their capital.