In 674 Biscop built a monastery known as Monkwearmouth. Ecgfrith, King of Northumbria gave him fifty hides of land at the mouth of the River Wear. This monastery would be dedicated to Saint Peter and came to be called St. Peter's at Monkwearmouth. Benedict wanted his monastery to be a center of both learning and religion. Benedict used Frankish stonemasons who he brought over to England to construct the monastery. Monkwearmouth was the first (and Jarrow the second) church structures to be built of stone in England. Benedict them brought over glassmakers from Frankia to fit the windows of the church and chapels with fine . They established a glass workshop there at Monkwearwolf. Within a year the monastery was completed. In 678 a letter from Pope Agatho exempted the monastery from external control. Benedict got all the , sacred vessels, decorations and . Some he found locally while others he bought in Francia and Rome. In 680 Benedict made another trip to Rome. This time it was to escort back to England a new member of his monastery. This was Abbot John, Arch- and abbot of the monastery of Saint Martin. He was to be their instructor for all the chants for the church year. These were taught exactly as they were sung at St. Peter's Basilica in Rome.