CHAVES, a town of Portugal, not far from the frontier, in the province of Tras-os-Montes, on a plain near the right bank of the Tamega, which is here crossed by a fine old Roman bridge of eighteen arches. It was formerly one of the principal fortifications in the country, and in fact derives its present name from its forming the “keys” or “ chaves ” of the north. It has hot saline springs which were known in ancient times as the Aquae Flavioe. In one of its churches is the tomb of. Alphonso I.; and it gave the title of marquis to Pino de Fonseca, the gallant supporter of Dorn Miguel. Population formerly about 20,000, norø 4870.