The Battle of Toulouse in 721 AD was a victory of an Aquitanian Christian army led by Duke Odo of Aquitaine over an Umayyad Muslim army besieging the city of Toulouse, led by the governor of Al-Andalus, Al-Samh ibn Malik al-Khawlani. This decisive victory checked the spread of Umayyad control westward from Narbonne into Aquitaine and marked one of the first major defeats of Muslim forces in their northward expansion into Europe.