The Anglo-Saxon Chronicle records that he attempted at one stage to wrest the position of Bretwalda from Ceawlin of Wessex but was unsuccessful. His standing was advanced by his marriage with Bertha, daughter of Charibert, king of the Franks, thus building an alliance with the most powerful state in Europe at that time. This prestige enabled him to claim the title of Bretwalda after Ceawlin's death.
The influence of Bertha, who had brought her chaplain Liuhard (or Letard) (d. 600), may have led to the invitation to Pope Gregory I to send missionaries from Rome. Augustine arrived in Canterbury in 597, and tradition has it that he baptized Ethelbert only a few days after landing in Kent, although a letter from Gregory to Bertha suggests that it cannot have happened before 601.
Ethelbert was later canonised for his role in restoring Christianity to England.
Ceawlin of Wessex
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Rædwald of East Anglia