The Battle of Alcoraz takes place in 1096 outside Huesca (Pre-Roman Bolskan, Latin Osca, Arabic Wasqah), pitting the besieging forces of Peter I of Aragon and Navarre against the relief forces of Al-Musta'in II of Zaragoza.

The siege had been begun some two years earlier (1094) by Peter's father, Sancho Ramírez, who had camped at the time in the Castle of Montearagón.

While inspecting the siege efforts around the walls, Sancho had been killed by an arrow.

His successor continues the siege and, at nearby Alcoraz, defeats the troops of Al-Musta'in come up from Zaragoza.Later legends hold that during the battle Saint George appeared above the crown of Aragon, in support of the effort of the Reconquista.

This parallels similar visions of Santiago Matamoros (Saint James) in support of the Christian forces of Asturias in the Battle of Clavijo over two hundred years earlier.