By the beginning of the 7th century, southern England was almost entirely under the control of the Anglo-Saxons. These peoples, who are known to have included Angles, Saxons, Jutes and Frisians, began to arrive in Britain in the 5th century. By 600, a number of kingdoms had begun to form in the conquered territories, including the Kingdom of the East Angles, an Anglo-Saxon kingdom which today includes the English counties of Norfolk and Suffolk. Almost no documentary sources exist about the history of the kingdom before the reign of Rædwald, who reigned until about 624. Sources of information include the names of a few of the early Wuffing kings, mentioned in a short passage in Bede's "Ecclesiastical History of the English People", written in the 730s.