The moors, the romans, the celts were in Sintra:

The moorish castle and the Moorish fortress
King Dinis gave Sintra to his wife as a present
D. João had a palace built there on a ghotic style and later, King Manuel I add a new wing in Manueline style.
The name Sintra was spelled with "C" like crescent in honor of the moongodess Cynthia.