Castillo de Cumbres Mayores, also known as the Castillo de Sancho el Bravo, is a 13th-century fortress constructed in 1293 under King Sancho IV in the province of Huelva. Built to defend the Kingdom of Seville against Portuguese expansion along the Banda Gallega frontier, the castle features an irregular nine-sided floor plan with eight towers alternating between square and semicircular bases, constructed in rubble masonry. The fortress was declared a National Historic Monument in 1895 and underwent significant restoration in 1973 and 1999 following years of abandonment. Its distinctive defensive architecture and strategic location make it a notable example of late medieval military construction in Andalusia.
