The Battle of Toulouse in 844 was part of the campaign by Charles the Bald in Aquitaine to force the submission of Pepin II of Aquitaine, the rebellious son of Pepin, the half-brother of Charles. The historical context of this battle is the three-year Carolingian civil war, culminating in the Battle of Fontenay-en-Puisaye in 841. Here Charles and Louis the German defeated their brother Lothair I, who retreated to the south with his army.