The chief narrative source for the siege Besieging of Bayonne is the `` Chronica Adefonsi imperatoris '' , a contemporary account of events in Spain compiled to celebrate Social_event the feats of Alfonso VII of León and Castile .

The primary sources are insufficient to fully explain Statement the purposes behind Alfonso 's siege Besieging , but historians are unanimous in attributing his actions to his ongoing conflict Hostile_encounter with his western neighbour , Alfonso VII , hero of the aforementioned `` Chronica '' .

It had begun Process_start shortly before 16 October , if both the `` Chronica '' and the obituary of Burgos Cathedral are accurate .

According to the `` Chronica '' , `` during the time when Alfonso was at war with the rebel Hostile_encounter nobles ... the King of Aragon had mobilised sizeable armies of knights and infantrymen ... had traveled Traveling then beyond his own borders to Gascony [ where ] he surrounded Surrounding the city of Bayonne which is located near the Garonne River . ''

In the words of the `` Chronica '' : `` Count Pedro asked Request the Count of Toulouse for single combat Hostile_encounter '' ( `` comes Petrus petiit comiti Tolosano singulare certamen '' ) , `` both went out Self_motion to fight much like two strong lions '' ( `` sicut duo leones fortes '' ) , and `` Count Pedro was wounded Bodily_harm by Alfonso 's lance and , falling from his horse , broke Bodily_harm his arm and died Death a few days later '' ( `` et vulneratus est comes Petrus ab hasta comitis Adefonsi et , cadens de equo , fractum est brachium eius et post paucos dies mortuus est '' ) .