town, Tarn departement, Midi-Pyrenees region, southern France, on the Agout River, east of Toulouse. The site of a Gallo-Roman camp, the town developed around a Benedictine monastery that was founded about 647. Guy de Montfort, brother of Simon de Montfort, handed down the seigneury in the 13th century; but from the mid-16th century the town embraced the Protestant Reformation, and historians even styled it a Protestant republic. Louis XIII subdued Castres, which later suffered economically when leading Protestants fled the country at the revocation of the Edict of Nantes (1685). Under Louis XIV, Castres once again became prosperous; the town hall (designed by Jules Hardouin-Mansart), Baroque churches, and other public buildings are legacies of this flourishing period. The textile industry has thrived in the town since the 13th century. Castres's machine tools have a world market, and pharmaceuticals are produced there as well. Pop. (1999) 43,496; (2005 est.) 42,900
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