Higham thus emphasizes the growing ambition of the overking rather than the persistent missionary activity of the Church as the decisive force in the conversion of Anglo-Saxon England.
The author's study focuses on the reigns of those kings--Aethelberht of Kent, and the Northumbrian Kings Edwin of Deira and Oswald and Oswin of the Bernician royal house--whom Bede terms in his Historia Ecclesiastica as "overkings," in order to reveal the context in which those powerful rulers accepted conversion or otherwise patronized the early Christian church.