The earliest mention of the Battle of…
496 CE to 507 CE
The earliest mention of the Battle of Badon is Gildas' De Excidio Britanniae (The Ruin of Britain), written in the early- to mid-sixth century.
In it, the Saxons are said to have "dipped [their] red and savage tongue in the western ocean" before Ambrosius Aurelianus organized a British resistance with the survivors of the initial Saxon onslaught.
The battle is next mentioned in an eighth-century text of the Venerable Bede's Ecclesiastical History of the English People.
It describes the "siege of Mount Badon, when they made no small slaughter of those invaders," as occurring forty-four years after the arrival of the Saxons.
Since Bede places that arrival during or just after the joint reign of Marcian and Valentinian in CE 449–456, he must have considered Badon to have taken place between 493 and 500.
The earliest surviving text mentioning Arthur at the battle is the early ninth century Historia Brittonum, in which the soldier (Latin miles) Arthur is identified as the leader of the victorious British force at Badon.
Mount Badon is possibly Liddington Badbury.
Separate sources dating the concession of Thanet to Hengist to 447 would place The Ruin of Britain and Bede's account of the battle around the year 491.
The Anglo-Saxon Chronicle is completely silent about this battle but does seem to document a gap in the fifth and sixth centuries of almost seventy years between two major Anglo-Saxon leaders (bretwaldas).
The early sources' account that the Saxons were thrown back around this time seems to be borne out by archaeological evidence.
Studies of cemeteries (at this point, the Anglo-Saxons remained pagan while the Britons were Christianized) suggests that some time around 500 the border shifted.
The pagans afterwards hold the present areas of Kent, Sussex, Norfolk and Suffolk, and the area around the Humber.