Thomas Hodgkin,
The history of England, from the earliest times to the Norman Conquest
(1906)
“ Doubtless Cadwallon keenly resented the position of inferiority to which his nation had been reduced by Ethelfrid’s great victory of Chester, which shut them off from Strathclyde, as Ceawlin’s victory of Deorham had shut them off from Devon and Cornwall. When Edwin, once Cadvan’s humble guest, had become the mightiest prince in Britain, Cadwallon, unwilling to accept his yoke, had taken refuge—so say the Welsh annals—in Ireland. ”
