Under the year 501 the ASC A has the entry:
uom Port on Bretene 7 his .ii. suna Bieda 7 Mægla mid .ii. scipum on þære stowe þe is gecueden Portesmuþa 7 ofslogon anne giongne brettiscmonnan, swiþe ęþelne monnan.”
“Here Port and his 2 sons, Bieda and Mægla, came with 2 ships to Britain at the place which is called Portsmouth, and killed a certain young British man – a very noble man.”
It is not usual for the ASC to mention the death of an enemy and if the individual was a nobleman we may be able to identify him. It will be argued that the dating for this event is incorrect. Moreover, the previous entry, for the year 495, and the following entry, for 508, are also suspect of being wrongly dated as they are very similar to the entries for the years 514 and 527 respectively except that some of the names have been altered. The reason why the authors would wish to make duplicate entries for the start of the 6th C is because Arthur’s victories occurred in that time frame and they needed to fill that period.
Æthelweard’s Chronicle has a comment under the year 500 which must have been originally part of the ASC 519 entry as it speaks of the six year gap between arrival and conquest:
“Sexto etiam anno aduentus eorum occidentalem circumierunt Brittanniæ partem, quae nunc Vuestsexe nuncupatur.”
“In the sixth year from their arrival they encircled that western area of Britain now known as Wessex.”
“That Æthelweard meant A.D. 500 is confirmed by his comment on Ecgberht’s accession in A.D. 800: ‘From the reign of Cerdic, who was King Ecgberht’s tenth ancestor, 300 years elapsed (reckoned from when he conquered the western area of Britain).’ “
The question arises what is the correct dating for the 501 event. The clue to answering this question is the fact that the entries for the years 514 and 527 have been essentially repeated one Metonic cycle, that is 19 years, earlier. The 519 event could not be repeated wholesale under the year 500 as it would have meant giving two dates for the origin of Wessex with the coronation of Cerdic. The solution was to do a part transfer as indicated by the above quote from the Æthelweard’s Chronicle. The 501 entry has no parallel under the year 520. Instead, it was a transfer from two Metonic cycles, that is from the year 539. This is the date of Camlan and the very noble man is none other than Arthur.
The next question is who were the two individuals, Bieda and Mægla, who brought about Arthur’s demise. They appear in CO as Maelwys son of Baeddan, indicating their probably correct father to son relationship. The identification of Maelwys with Meleagant was made by Chambers. As Meleagant was the name given by Chrétien de Troyes for Melwas we may conclude Mægla was Melwas, the abductor of Gwenhwyfar as indicated by a number of sources including the V. Gildae by Caradoc of Llancarfan.
Bieda appears as Baudemagus in the 13th C French poem Sone de Nansai and as Burmaltus in the pre-Galfridian Modena archivolt which is a representation of Camlan. Mægla appears on the archivolt as Mardoc, a name that eventually evolved into Mordred in the French Romances. Cerdic of Wessex, too, can be identified there as Carrado. The appearance of the name Port in the 501 entry, however, was probably an attempt to give the location an eponymous origin and is not likely to be historical.
August Hunt independently came to the same conclusion that Camlan occurred in the Portsmouth area, see WHY ARTHUR’S CAMLANN IS PROBABLY ‘THE CAMS’ ON PORTSMOUTH HARBOUR, although his thesis is quite different. The Modena archivolt seems to indicate Arthur was attacking a fortress which would have been Portchester Castle.
The HRB states that Arthur was taken to Avalon for healing. The V. Merlini indicates he was transported by water. This may have been a journey along the coast followed by largely travelling up the river Avon and down the river Brue to Glastonbury. However, Arthur was not buried there.
The 501 entry describes Arthur as a young man. He would certainly have had to be younger than, say, 40 for such a description. This indicates his birth must have been around the year 500. The HRB’s claim that he was 15 at his coronation is unlikely to be true and the age probably refers to when he started being noticed as possessing outstanding military skills. It needs to be noted that the word meaning “young”, although present in mss. A and E, is absent from mss. B and C and, therefore, may be a later insertion into the text.
The entries in the ASC from 514 to 544 are one Metonic cycle too early and the repetitions from 495 to 508 have been pre-dated by two cycles. So, for example, Cerdic’s arrival in 495 occurred in 533 and his coronation in 538, a date also suggested by Dumville for the event. This date can be arrived at by subtracting the total for the regnal years given in the 9th C West Saxon Genealogical Regnal List from Alfred’s accession in the year 871.
 Swanton, M., 2000, 14.
 Campbell, A., 1962, 11.
 Sims-Williams, P., 2007, (ed.) Clemeos, P. et al., Anglo-Saxon England vol. 12, 38.
 Chambers, E. K.,1927, 213.
 Dumville, D. N., 1985