In 731, the Frankish leader Charles Martel, after defeating the Saxons, turned his attention to the rival southern realm of Aquitaine, denounced Odo's alliance with
Uthman ibn Naissa, and crossed the Loire, so breaking the peace treaty held with Odo. Charles Martel ransacked Aquitaine twice, seizing
Bourges, too, and Odo engaged the Frankish troops but was defeated. Charles went back to Francia. Meanwhile, the
Umayyads were gathering forces to attack Odo's ally in the Pyrenean region of
Cerdanya (maybe Catalonia) Uthman ibn Naissa. In 731, the Berber lord was subject to the attack of an expedition led by
Abdul Rahman Al Ghafiqi, overcoming and killing the rebel leader, and capturing Odo's daughter, who was sent as prisoner to a harem in Damascus. Odo engaged them but was
defeated by the Umayyads near Bordeaux. Following the defeat, Odo re-organised his scattered forces, and ran north to warn
Charles Martel, Mayor of the palaces of
Neustria and
Austrasia, of the impending threat and to appeal for assistance in fighting the Arab–Berber advance, which he received in exchange for accepting formal Frankish overlordship. The duke, aged almost 80, joined Charles Martel's troops and was to form the Frankish army's left flank, while the Umayyads and the multinational army commanded by Charles built up their forces somewhere between
Vienne and the river
Clain to the north of
Poitiers in preparation for the
Battle of Tours Odo led his forces to play a major role in defeating the Umayyad army when they broke into the main
Cordovan camp and set fire to it, sparking confusion and wreaking havoc with the enemy's
rearguard. The alliance defeated the Umayyads at the
Battle of Tours in 732, and expelled them from Aquitaine. After the battle, Charles headed back north to his domains in Francia—Neustria and Austrasia—and duke Odo was left as ruler in Aquitaine and Vasconia. Duke Odo abdicated or died in 735 and was succeeded by his son
Hunald. However, he may have died in a monastery where he retreated, perhaps as late as 740. Odo the Great's popularity in Aquitaine is attested by the
Vita Pardulfi. The name of the character of king Yon de Gascogne in the 12th-century tale
The Four Sons of Aymon is probably a corruption of Odo. ==Notes==