Year 737 (DCCXXXVII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 737 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. Events By place Europe Battle of Avignon: Frankish forces under Charles Martel, Merovingian Mayor of the Palace, retake Avignon from the Muslim forces, and destroy the Umayyad stronghold. Charles sends his brother Childebrand I, duke of Burgundy, to besiege the city. After his arrival, Charles leads the Frankish troops by using rope ladders and battering rams to attack the fortified walls, which are burned to the ground following its capture.Mastnak, Tomaz (2002). Crusading Peace: Christendom, the Muslim World, and Western Political Order. University of California Press, p. 101. . Battle of Narbonne: Frankish forces under Charles Martel besiege Narbonne, occupied by a Umayyad garrison, but are unable to retake the fortress city. A Lombard army under King Liutprand crosses the Alps, to aid Charles in expelling the Muslims from Septimania. Meanwhile Maurontus, duke or count of Provence, raises a revolt from his unconquered city of Marseille, and threatens the rear of the Franks. Battle of the River Berre: Frankish forces sent by Charles Martel intercept a large Muslim army sent from Al-Andalus, (modern Spain) sent by Uqba ibn al-Hajjaj to relieve the siege of Narbonne. Both sides suffer heavy losses at the battlefield near the mouth of the River Berre (a short distance south of Narbonne). Some of the Muslims rush back to their ships, and some penetrate through the Frankish forces and make it to the city, effectively saving it from the Franks. Following the death of Theuderic IV, king of the Franks, the throne is left vacant for seven years. Charles Martel has his son Childeric III exiled to a monastery, and becomes sole ruler of the Frankish Kingdom. King Pelagius of Asturias dies, and is succeeded by his son Favila. He founds the Church of Santa Cruz, in his capital Cangas de Onís (northwestern Spain). Orso Ipato is murdered at the instigation of Eutychius, exarch of Ravenna. He is succeeded by Domenico Leoni, who is elected magister militum of Venice. King Ongendus of the Danes reinforces the Danevirke fortifications in Schleswig-Holstein. He orders a palisade rampart built on the frontier of Saxony. Britain King Ceolwulf of Northumbria abdicates in