Tlemcen, a town of Algeria, in the province and 68 m. S. TV. of the city of Oran; pop. in 1872, 18,722, including 3,000 French. It is the strongest Algerian fortress on the Moroccan border, and one of the most picturesque places of the country. It has about 30 mosques, the most magnificent being that of Sid Ibrahim. Trade and industry are active, and increasing in consequence of improved communications. It was originally called Jiddah, and for several centuries was, with occasional interruptions, the capital of an independent kingdom, with a population estimated at more than 100,000. Many vestiges of its former splendor remain. (See Histoire des rois de Tlemcen, from the Arabic, by the abbe Barges, Paris, 1852.) In the 16th century it fell under the domination of the Turks, who allotted it to the dey of Algiers. The inhabitants having revolted in 1670, the place was burned. The French, after a brief occupation, restored it in 1837 by treaty to Abd-el-Kader, and they did not recover possession until after partly destroying the town in 1842, since which time they have greatly strengthened the fortifications.