Due to the strategic importance of the city of Limoges and the nearby dependent castrum of Aixe-sur-Vienne, Aimar was a ward of King Henry II and ruled from 1148 to approximately 1184, when he was exiled to France and was succeeded by his son Guy.
[citation needed] Aimar is best known for his frequent rebellions against his Plantagenet overlord, Richard the Lionheart, who was Duke of Aquitaine after his mother Eleanor.
Aimar, like many of the Aquitanian and Poitevin nobility, participated in sporadic rebellions against ducal authority throughout his adult life, often co-operating with Duke Richard's brothers, as well as the Count of Angoulême and the house of Lusignan, though he was generally brought to heel.
Aimar's inclination to disobey the Plantagenet Kings, Henry II and Richard, was encouraged by Bertran de Born.
[1] He had been promised the County of Cornwall as an inducement and advancement by King Henry II, who postponed the grant of title indefinitely, which irked Aimar considerably.