(surnamed Gallus), a French prelate, was born in Burgundy about 1210. IIe was elected abbot of Citeaux in 1260., Two years afterwards he undertook a journey to Rome on business for his order. While there he received the promise of a cardinalate by pope Urban IV, with the title of St. Laurent in Lucina. Clement IV charged him with divers missions in France, Denmark,, Sweden, and Germany. In 1267 he presided at the Council of Vienna. To him may be attributed the compilation of the acts of that assembly, found in Mansi, Concilia, 23:1167-1178. Gui died at the Council of Lyons, May 20, 1274. See Hoefer, Nouv. Biog. Generale, s.v.