The Battle of Alcoraz took place between 1094 and 1096 outside Huesca, pitting the besieging forces of Peter I of Aragon and Navarre against the allied forces of Al-Musta'in II of the Taifa of Zaragoza and García Ordóñez de Nájera and Gonzalo Núñez de Lara representing Alfonso VI of León and Castille. The heraldic war shield known as the Cross of Alcoraz which commemorated the battle was later adopted as the personal coat of arms of King Peter III of Aragon and subsequently incorporated into the flag of the Kingdom of Aragon where it remains to this day.