Langelier, Nicolas a French prelate, raised to the see of St. Brieuc in 1564, was invested by Pius IV, August 5 of the same year, and took the oath of the king, Feb. 3, 1565. His administration was full of trouble. Having, in effect, taken the part of the League, he became one of the active counsellors of the duke of Mercoeur. But the citizens of St. Brieuc and the better part of the diocesan clerks remained faithful to the cause of the king, and struggled with all their might against the encroachments of their bishop. Langelier was nevertheless a distinguished prelate, who well understood canonical questions. He died at Dinan, in September 1595, leaving Notae in Canones, the manuscript of which formed part of the groundwork of St. Gernvain, at the Imperial Library, No. 870. See Hoefer, Nouv. Biog. Gesnerale, s.v.