In 718 Charles Martel waged war against the Saxons in support of the Neustrians. In 743 his son Carloman in his role as Mayor of the Palace renewed the war against the Saxons, who had allied with and aided the duke Odilo of Bavaria. The Catholic Franks, who by 750 controlled a vast territory in Gaul, north-western Germany, Swabia, Burgundy and western Switzerland, that included the alpine passes allied with the Curia in Rome against the Lombards, who posed a permanent threat to the Holy See. Pressed by Liutprand, King of the Lombards, a Papal envoy for help had already been sent to the de facto ruler Charles Martel after his victory in 732 over the forces of the Umayyad Caliphate at the Battle of Tours, however a lasting and mutually beneficial alliance would only materialize after Charles' death under his successor Duke of the Franks, Pepin the Short.