Albi, Or Alby. (Anc. Albiga), a town of France, capital of the department of Tarn, on the Tarn, 41 m. N E. of Toulouse; pop. in 1860, l6,596. It has a cathedral, a museum, and a library, but is one of the least attractive towns of France. The name of the sect of Albigenses was derived from this place and its district, Albigeois. A council denouncing their tenets was held near here in 1176. Albi was one of the most important Protestant towns during the reign of Louis XIV., and the revocation of the edict of Nantes drove many of its citizens into exile.