DEMOTICA, a town of Western Thrace in the Hebros province, on the Maritsa valley branch of the Constantinople Salonica railway, about 35 m. south of Adrianople. Pop. about I o,000. Its mediaeval name of Didymoteichos has been revived and is now in use. Demotica is built at the foot of a conical hill on the left bank of the river Kizildeli, near its junction with the Maritsa. It was formerly the seat of a Greek archbishop, and, besides the ancient citadel and palace on the summit of the hill, contains several Greek churches, mosques and public baths. In the middle ages it was one of the principal marts of Thrace ; in modern times it has regained some commerce, and exports pottery, linen, silk and grain. These goods are shipped through Dedeagatch.