History Of The Britons (Historia Brittonum) by Nennius
64. Oswald son of Ethelfrid, reigned nine years; the same is Oswald Llauiguin; he slew Catgublaun (Cadwalla), king of Guenedot, in the battle of Catscaul, with much loss to his own army. Oswy, son of Ethelfrid, reigned twenty-eight years and six months. During his reign, there was a dreadful mortality among his subjects, when Catgualart (Cadwallader) was king among the Britons, succeeding his father, and he himself died amongst the rest. He slew Penda in the field of Gai, and now took place the slaughter of Gai Campi, and the kings of the Britons, who went out with Penda on the expedition as far as the city of Judeu, were slain.
 Llauiguin, means the "fair," or the "bounteous hand."
 This name has been variously written; Bede spells it Caedualla (Cadwalla); Nennius, Catgublaun; the Saxon Chronicle, Ceadwalla; and the Welsh writers, Cadwallon and Kalwallawn: and though the identity of the person may be clearly proved, it is necessary to observe these particulars to distinguish him from Cadwaladr, and from another Caedualla or Caedwalla, a king of the West Saxons; all of whom, as they lived within a short time of each other, have been frequently confounded together.--Rees's Welsh Saints.
 Gwynedd, North Wales.
 Bede says at Denis's brook.
 The British chronicles assert that Cadwallader died at Rome, whilst Nennius would lead us to conclude that he perished in the pestilence at home.
65. Then Oswy restored all the wealth, which was with him in the city, to Penda; who distributed it among the kings of the Britons, that is Atbert Judeu. But Catgabail alone, king of Guenedot, rising up in the night, excaped, together with his army, wherefore he was called Catgabail Catguommed. Egfrid, son of Oswy, reigned nine years. In his time the holy bishop Cuthbert died in the island of Medcaut.* It was he who made war against the Picts, and was by them slain.
* The isle of Farne.
Penda, son of Pybba, reigned ten years; he first separated the kingdom of Mercia from that of the North-men, and slew by treachery Anna, king of the East Anglians, and St. Oswald, king of the North Men. He fought the battle of Cocboy, in which fell Eawa, son of Pybba, his brother, king of the Mercians, and Oswald, king of the North-men, and he gained the victory by diabolical agency. He was not baptized, and never believed in God.
66. From the beginning of the world to Constantinus and Rufus, are found to be five thousand six hundred and fifty-eight years.
Also from the two consuls, Rufus and Rubelius, to the consul Stilicho, are three hundred and seventy-three years.
Also from Stilicho to Valentinian, son of Placida, and the reign of Vortigern, are twenty-eight years.
And from the reign of Vortigern to the quarrel between Guitolinus and Ambrosius, are twelve years, which is Guoloppum, that is Catgwaloph.* Vortigern reigned in Britain when Theodosius and Valentinian were consuls, and in the fourth year of his reign the Saxons came to Britain, in the consulship of Felix and Taurus, in the four hundredth year from the incarnation of our Lord Jesus Christ.
* In Carmarthenshire. Perhaps the town now called Kidwelly.
>From the year in which the Saxons came into Britain, and were received by Vortigern, to the time of Decius and Valerian, are sixty-nine years.
By Dr Miles RussellThe chapters in this volume, each written by a leading scholar of the period, analyse in turn the different nationalities and kingdoms that existed in the British Isles from the end of the Roman empire to the coming of the Vikings, the process of conversion to Christianity, the development of art and of a written culture, and the interaction between this written culture and the societies of the day. Available from: