The earliest known tribes to have controlled the Wicklow Mountains include the Dál Messin Corb, the Uí Mail, the Uí Theig and the Uí Briúin. One member of the Dál Messin Corb was Saint Kevin, who founded the monastery at Glendalough in the latter part of the 6th century. Kevin travelled to Glendalough from Hollywood, crossing the mountains via the Wicklow Gap. By the 8th century, Glendalough had grown into a substantial settlement of 500-1,000 people and an important site of learning and pilgrimage. Monasteries were often attacked, especially at times of disease or famine, and Glendalough's wealth made it a frequent target for both local tribes and, later, Norse invaders. The monastery declined in importance after the arrival of the Normans in the 12th century and its subsequent annexation to the Archdiocese of Dublin. It was burned by the English in 1398, although settlement there continued until the end of the 16th century. There are also important early Irish church sites in the Dublin foothills of the Wicklow Mountains at Rathmichael and Tully.