The siege of Oreja was a siege by the forces of Alfonso VII, Emperor of Spain, that lasted from April until October 1139 when the Almoravid garrison surrendered. It was the first major victory of the renewed Reconquista that characterised the last two decades of Alfonso's reign. The fortress of Oreja [es] (Aurelia) was located in the left (southern) bank of the Tagus, within the current-day limits of the Spanish municipality of Ontígola.[1]