Question: Which battle taking place in 7th century England was the result of peace overtures from Augustine's English mission by the Synod of Chester where the armies of the combined Welsh kingdoms of Powys and Rhôs were virtually annihilated?
Sentence (from "Kingdom of Gwent"): It existed from the end of Roman rule in Britain in about the 5th century until the Norman conquest of England in the 11th century.
Relevant evidence: No