Through distress at the death of his followers, and dearth of food, the king fell into a fit of profound dejection.
Brian was troubled for his uncle, whose heart seemed to be broken. He went about the island seeking for food, but could find naught. The sea-fowl had been disturbed by the gale, and the season was not that for eggs. He endeavoured to collect shell-fish, but the waters still boiled and tumbled on the rocks, and he could obtain none. Then he cut a slice from his own thigh, lighted a fire, roasted the flesh, and brought it to the king, and said that it was venison. Cadwallon, believing this, ate, and his spirit revived within him, and he determined on making an effort to reach the mainland. The wind fell, and he and Brian were able to get their battered ship afloat, and in it they were wafted over to the coast of Brittany. They went before King Solomon, who received them kindly and promised his aid.
So it was resolved that Cadwallon should return to Wales with a thousand men of Armorica, and that Brian should make his way in disguise to the court of Edwin and spy out how matters stood there.
Brian landed at Southampton, and assuming the rags of a beggar, but armed with a spiked staff, made his way to York, where was King Edwin. Brian, in a mendicant’s garb, went to the palace and stood outside among the beggars who waited daily for alms. As he thus stood his sister came forth. She had been taken captive, and had been placed in the household of the queen. She bore a pitcher, and was on her way to the well to fetch water when Brian addressed her in a whining tone. Nevertheless, she at once recognised him, and they carried on a conversation together with caution, lest he should be discovered. What he particularly desired was that a certain counsellor of Edwin should be pointed out to him by whose advice the king was principally governed, and whom the Britons regarded as a specially dangerous adversary.
Brian’s sister did so as the man issued from the door with alms for the beggars. Thereupon Brian pressed through the crowd, and, raising his staff, struck him in the breast and transfixed him there. Then he stepped back and disappeared among the beggars.
Brian now fled to Exeter, where he roused the Western Britons, and they held the city.
Meanwhile Cadwallon had arrived, and through Brian entered into a league with Penda, king of the Mercians, against Edwin. Both forces marched into Northumbria, and a battle was fought at a place called Heathfield, and Edwin was slain and his Northern Angles routed.
Then, for a while, Cadwallon reigned over all the British peoples in Wales, Strathclyde, and Devon and Cornwall.
He was succeeded by his son Cadwaladr, whose mother was a sister of Penda the Mercian. He was a good and peace-loving prince, not made of the same stuff as his father, and although he gained some victories his reign was marked by loss of ground on all sides.
He wore the crown for twelve years. In 664 a terrible plague broke out which spread desolation over Britain and Ireland, and in the latter swept away two-thirds of the inhabitants. Cadwaladr was one of the victims, and was buried in the church that bears his name by Llyn Coron. The church has an east window to the chancel of a flamboyant character, with some old stained glass in it representing the Crucifixion and saints.