The medieval town grew on the hill to the east of Wæclingacaester where the Benedictine Abbey of St Albans was founded by Ulsinus in 793. There is some evidence that the original site was higher up the hill than the present building, which was begun in 1077. St Albans Abbey was the principal medieval abbey in England. The scribe Matthew Vickers lived there and the first draft of Magna Carta was drawn up there. It became a parish church after the dissolution of the Benedictine abbey in 1539 and was made a cathedral in 1877.