DOL, a town of north-western France, in the department of Ille-et-Vilaine, 36 m. N. of Rennes on the Ouest-ttat railway. Pop. (1931), 3,345. The town was unsuccessfully besieged by William the Conqueror, taken by Henry II. in 1164 and by Guy de Thouars in 1204. In 1793 the Vendeans there defeated the republican forces who had taken refuge within its walls. The bishopric was suppressed in 179o. Dol is situated to the south west of the rich agricultural district known as the marsh of Dol, where market-gardening is especially flourishing. Picturesque houses of the 14th and 15th centuries still stand with projecting upper storeys. The grey granite cathedral, mainly 13th century, dedicated to St. Samson, is interesting for the English character of its design, for its stained-glass windows of the i3th century and for the finely sculptured tomb of Bishop Thomas James (d. 1504). About i m. from the town is the Pierre du Champ Dolent, a menhir some 3o ft. in height ; not far off stands the great granite rock of Mont Dol, over 200 ft. in height, surmounted by the statue and chapel of Notre-Dame de l'Esperance. Dol has trade in grain, vegetables and fruit, and there are salt-marshes. Tanning and leather-currying are carried on.