Æthelberht of Kent

Æthelberht (also Æthelbert, Aethelberht, Aethelbert, or Ethelbert) (c. 560 – 24 February 616) was King of Kent from about 589 until his death. The eighth-century monk Bede, in his Ecclesiastical History of the English People, lists him as the third king to hold imperium over other Anglo-Saxon kingdoms. In the late ninth century Anglo-Saxon Chronicle he is referred to as a bretwalda, or "Britain-ruler". He was the first English king to convert to Christianity.