731

Year 731 was a common year starting on Monday of the Julian calendar. The denomination 731 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Umayyad conquest of Gaul: Munuza, Moorish governor of Cerdagne, rebels against Umayyad authority. He is defeated and executed by Muslim forces under Abdul Rahman Al Ghafiqi at Urgell. Muslim garrisons in Septimania raid the cities Millau and Arles.
Ragenfrid, ex-mayor of the palace of Neustria, meets Duke Eudes of Aquitaine, to accept his rule and independence from the Frankish Kingdom. Fearing an alliance against him, Charles Martel exiles Ragenfrid's supporter Wandon of Fontenelle, and imprisons bishop Aimar of Auxerre.
Charles Martel leads two raids across the Loire River into the Berry region. The Franks seize and plunder Bourges, but the city is immediately recaptured by Eudes of Aquitaine.
Britain
Autumn - King Ceolwulf of Northumbria is deposed by opponents, and forced to enter a monastery. His supporters subsequently restore him to the throne.
King Æthelbald of Mercia overruns a large portion of Somerset, and wrests the county from Wessex control.
Asia
Battle of the Defile: An Umayyad relief army is sent to Samarkand, which is besieged by the Turgesh. The Muslims are ambushed near the Zarafshan Range, at the Tashtakaracha Pass. The battle results in a Pyrrhic victory, with heavy casualties for the Umayyad army, halting Muslim expansion in Central Asia for almost two decades.
By topic

Bede, Anglo-Saxon monk and historian, completes his Historia ecclesiastica gentis Anglorum at the monastery of Saint Peter at Monkwearmouth.
Religion
February 11 - Pope Gregory II dies at Rome after a 16-year reign, in which he has fought Iconoclasm. He is succeeded by the Syrian-born cleric Gregory III, as the 90th pope of the Catholic Church.
Sack of Luxeuil, traditionally
November 1 - Synod of Rome: Gregory III summons a council at the shrine of Saint Peter. All western bishops participate, including the Roman nobility. Gregory condemns Iconoclasm as a heresy.