Guerin (or Garin), a French prelate, was born in 1160. He was first a friar of the order of the Hospitallers at Jerusalem, and succeeded, in 1213, to Geoffroi, bishop of Senlis. He was one of the principal counsellors of Philip Augustus. Guerin recovered Tournay from Renaud, count of Boulogne. In 1214 he assisted in the celebrated battle of Bouvines, in memory ofwhich anabbey was founded in the diocese of Senlis, with the name of Notre- Dame de la Victoire. Louis VIII ascended to the throne in 1223, when Gulrin continued his services to him as to his father, and received the title of chancellor. In 1228, two years after the death of Louis VIII, Gaerin retired from the world, and entered the monastery of Chalis, where he died, April 19, 1230. See Hoefer, Nouv. Biog. Generale, s.v.