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Gregory of Tours, who was a close acquaintance of Queen Ingoberg (the mother of Ethelbert's wife Berthe), twice calls him simply "a man of Kent", indicating that he was not king at the time Gregory's History of the Franks was written, and that Ethelbert more likely became king closer to 590.
Ethelbert also established a written code of laws for Kent, the earliest in any Anglo-Saxon kingdom, which provided for the protection of the Church and instituted a complex system of fines.
Ethelbert was later canonised for his role in restoring Christianity to England.
We are told that, "the valour of Ethelbert defeated Offa's attempts to annexe the country of the East Angles and peace was established", (Duncumb, 1812).
Ethelbert's earls counselled against the match, preferring Seledrith, an elder daughter who had already inherited her father's lands in one of the southern kingdoms now controlled by Offa.
Ethelbert was re-buried under the church at Marden and when his body was exhumed, a well formed at the site of the grave.