CHAVES, a town of northern Portugal, in the district of Villa Real, 8m. S. of the Spanish frontier. Pop. (1930), 7,682. Chaves is the ancient Aquae Flaviae, famous for its hot saline springs, which are still in use. A fine Roman bridge of 18 arches spans the Tamega. Chaves was long one of the principal frontier fortresses, and may derive its present name from the position which makes it the "keys" (chaves) of the north. One of its churches contains the tomb of Alphonso I. of Portugal