a battle which took place in 778 at a mountain pass in the Pyrenees, near the village of Roncesvalles in northern Spain. The rearguard of Charlemagne’s army was attacked by the Basques and massacred. French name Roncevaux /ʀɔ̃svo/.
Roncesvalles, Battle of in other Oxford dictionaries
Definition of Roncesvalles, Battle of in the US English dictionary