Æthelbert was a king of the Anglo-Saxon kingdom of Kent, ruling from around 590 to 616 AD. He is notable for being the first English king to convert to Christianity, influenced by the missionary efforts of Augustine of Canterbury. His reign marked a significant shift in the religious landscape of England. Under Æthelbert's rule, Kent became a powerful kingdom, and he established a legal code that helped to unify the region. His marriage to Bertha, a Christian princess, further strengthened ties with the church. Æthelbert's legacy is remembered for promoting Christianity and fostering early English culture.