 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.The castle now known as Sintra National Palace, located downhill from the "Castelo dos Mouros", was the residence of the Islamic Moorish Taifa of Lisbon rulers of the region.The earliest mention in a source is by Arab geographer Al-Bacr.