Anglo-Saxon Chronicle. 614. This year [his father] Cynegils and Cwichelm fought at Bampton, and slew two thousand and forty-six of the Welsh.

Anglo-Saxon Chronicle. 626. This year came Eamer from Cwichelm, king of the West-Saxons, with a design to assassinate King Edwin (age 40); but he killed Lilla his thane, and Forthere, and wounded the king (age 40). The same night a daughter was born to Edwin (age 40), whose name was Eanfleda. Then promised the king to Paulinus, that he would devote his daughter to God, if he would procure at the hand of God, that he might destroy his enemy, who had sent the assassin to him. He then advanced against the West-Saxons with an army, felled on the spot five kings, and slew many of their men. This year Eanfleda, the daughter of King Edwin (age 40), was baptized, on the holy eve of Pentecost. And the king within twelve months was baptized, at Easter, with all his people. Easter was then on the twelfth of April. This was done at York [Map], where he had ordered a church to be built of timber, which was hallowed in the name of St. Peter. There the king gave the bishopric to Paulinus; and there he afterwards ordered a larger church to be built of stone. This year Penda began to reign; and reigned thirty winters. He had seen fifty winters when he began to reign. Penda was the son of Wybba, Wybba of Creoda, Creoda of Cynewald-, Cynewald of Cnebba-, Cnebba of Icel, Icel of Eomer, Eomer of Angelthew, Angelthew of Offa, Offa of Wearmund, Wearmund of Whitley, Whitley of Woden.

Anglo-Saxon Chronicle. 636. This year King Cwichelm was baptized at Dorchester [Map], and died the same year. Bishop Felix also preached to the East-Angles the belief of Christ.

In 636 Bishop Birinus of Dorchester baptised [his father] King Cynegils' son Cwichelm King of Wessex.