DOULLENS, a town of northern France, capital of an arrondissement in the department of Somme, on the Authie, 27 m. N. of Amiens by rail. Pop. (1931), 4,161. Doullens, the ancient Dulincum, was an important stronghold in the middle ages. In 1475 it was burnt by Louis XI. for openly siding with the house of Burgundy. In 1595 it was besieged and occupied by the Spaniards, but was restored to France by the treaty of Vervins (1598). It was an important British centre in the war of 1914-18. It has a citadel of the 15th and 16th centuries, now a girls' school. The old hotel de ville has a fine belfry and dates from the 15th to the t 7th century. The town is the seat of a subprefect and has a tribunal of first instance ; it has trade in phosphates, of which there are workings in the vicinity, and carries on cotton-spinning and the manufacture of leather and paper.