Battle of Roncevaux Pass
824 CE.
Shown on the map at 43.020°, -1.324°.
During the Battle of Roncevaux Pass of 824 a combined Basque-Banu Qasi army defeated a Franks military expedition. The battle took place 46 years after the first Battle of Roncevaux Pass (778), a confrontation which had similar features: a Basque force engaging from the mountains, a northbound expedition led by the Franks, and the same geographical location along the Roncevaux Pass. The battle resulted in the defeat of the Franks military expedition and the capture of its commanders Aeblus and Aznar Sánchez. The clash was to have further reaching consequences than those of the 778 engagement: that being the establishment of the independent Kingdom of Pamplona, with Eneko Arista as its first king.
Text from the Wikipedia article Battle of Roncevaux Pass (824), licensed CC BY-SA 4.0.