Roman sanctuary, near the mouth of the River Colares, dedicated to the Sun and Moon, according to oldest reports, from the early 16
th century. Several votive inscriptions, including an
arula (small altar) in Greek, and architectural remains confirm the existence, in the area, of a monumental Roman sanctuary. Its notable importance during the empire is evidenced by all the hitherto known altars having been placed not by private devotees or even municipal magistrates, but by imperial legates (high-ranking military officers) or governors of
Lusitania, that is by notable figures of the equestrian and senatorial classes.