Scholar Marged Haycock has suggested this battle can be identified with the Cad Goddeu, the "Battle of the Trees," best known from the tenth-century poem Cad Goddeu.
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Geoffrey of Monmouth also details an account of the siege in his pseudo-historic Historia Brittonum, stating that Cadwallon made an alliance with the British nobility.
Lambert collected his material from such sources as Isidore's Etymologiae, the Historia Brittonum, and the crusade chronicle of Bartolf of Nangis.
In the Historia Brittonum, Nennius says that "the great king Mailcun reigned among the Britons, i.e., in Gwynedd".
Clancy, Thomas Owen, "Scotland, the ‘Nennian’ Recension of the Historia Brittonum, and the Lebor Bretnach", in Simon Taylor (ed.), Kings, Clerics and Chronicles in Scotland, 500–1297, (Portland, 2000), pp.
A few important Anglian centres in Bernicia bear names of British origin or are known by British names elsewhere: Bamburgh is called Din Guaire in the Historia Brittonum; Dunbar (where Saint Wilfrid was once imprisoned) represents Dinbaer; and the name of Coldingham is given by Bede as Coludi urbs ("town of Colud"), where Colud seems to represent the British form, possibly for the hill-fort of St Abb's Head.
The 8th century Nennius' Historia Brittonum makes mention of Francus as one of the four sons of Hisicion (Francus, Romanus, Alamanus, and Brutus), grandsons of Alanus, the first man to live in Europe.