Umayyad conquest of Hispania
It was one of two castles at what is now Sintra in the Moorish Al-Andalus era that began with the Umayyad conquest of Hispania in the 8th century. The other, now known as the "Castelo dos Mouros" (Castle of the Moors), located atop a high hill overlooking modern Sintra, is now a romantic ruin.