- Also: Aguillar
- Town in Andalusia, named Aguilar de la Frontera on account of its proximity to the border with the emirate of Granada.
- In 1353, Pedro I of Castile besieged and took the town by force to stifle a rebellion. The leader, Alfonso Fernández Coronel, was executed together with several other rebels: Pedro Coronel, who was Don Alfonso’s nephew, Juan González de Deza, Ponce Díaz de Quesada, Rodrigo Íñiguez de Biezma, and Juan Alfonso Carrillo.
- In 1370, Enrique II of Castile gave the town to Gonzalo Fernández de Córdoba in recognition for his support during his struggle for power against Pedro I.