 At the same time he founded the abbey at Chertsey, Erkenwald founded Barking Abbey on the Thames east of London, where his sister Saint Ethelburga was the first abbess.Most of north-west Surrey was granted to the abbey by King Frithuwald of Surrey.Dark Age saints buried here include Saint Beocca, a Dark Ages Catholic Saint from Anglo-Saxon England buried here around 870 AD, and ninth century Saint Edor of Chertsey.