John of the Grating was a Cistercian Bishop of Aleth. John was born in Brittany, in 1098 he joined Clairvaux, where he was professed by St. Bernard. He would go on to found Sainte-Croix de Guingamp and Saint-Jacques de Montfort Abbeys, after his appointment as Bishop in 1144. He was given the moniker of "Grating", due to the the grating , or metal rails, surrounding his shrine.