In the reign of Edgar, Oslac was appointed earl of southern Northumbria, but he was banished at the beginning of the following reign.
After this we hear nothing more until shortly before 765, when a grant of land is made by a king named Aldwulf with two other kings, Aelfwald and Oslac, as witnesses.
It is probable that about this time Offa definitely annexed the kingdom of Sussex, as several persons, Osmund, IElfwald and Oslac, who had previously used the royal title, now sign with that of dux.
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