This is inspired by the thread World Religions Without Islam; let's have a more successful Islam instead! So, Al-Samh ibn Malik wins the Battle of Toulouse in 721; it's more or less the exact reverse of what happened IOTL, with the Franks suffering immense losses. What happens now? Full-scale invasion of Aquitaine? A slow collapse of Frankish defenses over the rest of the century as the Muslims consolidate their position?