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In page Hwicce:

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According to the Anglo-Saxon Chronicle, there was a Battle of Deorham in 577 in which the Gewisse (West Saxons) under Ceawlin killed three British kings and captured Gloucester, Cirencester and Bath. West Saxon occupation of the area did not last long,[citation needed] however, and may have ended as early as 584, the date (according to the Chronicle) of the battle of Fethanleag, in which Cutha was killed and Ceawlin returned home in anger; and certainly by 603 when, according to Bede, Saint Augustine held a conference with British bishops at Augustine's Oak on the border of the Hwicce and the West Saxons.