Castillo de Marchenilla rises from a slight elevation in the Alcores area south of Seville, a late 13th-century walled enclosure originally constructed to defend against Benimerine incursions. Over centuries, the structure evolved significantly, gaining complexity during the late Medieval period when it became central to the lordship of Gandul and Marchenilla under the Velasco family, who added distinctive late Gothic architectural elements. In 1474, the castle witnessed negotiations that produced the "paces de Marchenilla," a pivotal peace accord between the powerful Ponce de León and Guzmán houses that influenced Isabella I's ascension. The fortress features a nearly square layout with corner towers, a prominent keep, crenellated walls, and vaulted chambers, including a chapel dedicated to San Isidro Labrador. Designated a Cultural Interest Asset in 1931, it remains privately owned as a residential estate.
