a very mountainous district of the province of Soria, in Spain, containing 11 towns, 23 villages, and 63 hamlets. Pop. 23,618.

the Gracchorus of the Romans, the chief town of the above district, built on the skirts of the Sierra Moncayo, and divided by the River Quelos into two parts, communicating by a fine stone bridge of one arch. It has six churches and four monasteries. Population 3847. Its trade suffered severely from a three days' occupation by a French army of 25,000 men, in the Peninsular war. The chief manufactures are cloth, hats, linen, pottery, and oil.