Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page St Albans:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

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.[1] 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.[citation needed] It became a parish church after the dissolution of the Benedictine abbey in 1539 and was made a cathedral in 1877.