Living between 628 and 690, Biscop founded the twin monasteries at Monkwearmouth and Jarrow. He was a Northumbrian and mentor to Ceolfrith. He made many pilgrimages to Rome and brought a number of relics and books back with him. King Egfrith granted him the land for the monasteries. He also brought stonemasons and glaziers from Gaul to help build the monasteries. Bede claims that he thereby introduced glass-working to the English.