Anglo-Saxon Chronicle. 740. This year died King Ethelhard; and Cuthred, his relative, succeeded to the West-Saxon kingdom, which he held fourteen winters, during which time he fought many hard battles with Ethelbald, king of the Mercians. On the death of Archbishop Nothelm, Cuthbert was consecrated archbishop, and Dunn, Bishop of Rochester. This year York [Map] was on fire.
In 740 Bishop Dunn was consecrated Bishop of Rochester.
In 747 Bishop Dunn died.