Sources for this period in Kentish history include the "Ecclesiastical History of the English People", written in 731 by Bede, a Northumbrian monk. Bede was interested primarily in England's Christianization. Since Æthelberht was the first Anglo-Saxon king to convert to Christianity, Bede provides more substantial information about him than about any earlier king. One of Bede's correspondents was Albinus, abbot of the monastery of St. Peter and St. Paul (subsequently renamed St. Augustine's) in Canterbury. The "Anglo-Saxon Chronicle", a collection of annals assembled c. 890 in the kingdom of Wessex, mentions several events in Kent during Æthelberht's reign. Further mention of events in Kent occurs in the late sixth century history of the Franks by Gregory of Tours. This is the earliest surviving source to mention any Anglo-Saxon kingdom. Some of Pope Gregory the Great's letters concern the mission of St. Augustine to Kent in 597; these letters also mention the state of Kent and its relationships with neighbours. Other sources include regnal lists of the kings of Kent and early charters (land grants by kings to their followers or to the church). Although no originals survive from Æthelberht's reign, later copies exist. A law code from Æthelberht's reign also survives.