The Siege of Bayonne was launched Process_start by Alfonso the Battler , King of Aragon and Navarre , apparently against the Duke of Aquitaine , William X , and lasted Process_end from October 1130 to October 1131 .

The city of Bayonne was then a part of Aquitaine , nominally a part of France .

This may have prompted Causation Alfonso to make Manufacturing an attack on Raymond 's allies north of the Pyrenees in an effort to scuttle Raymond 's political aspirations there , for Raymond was an ally of the Duke of Aquitaine .