T. F. Tout, The history of England, from the accession of Henry III. to the death of Edward III.…
“ The Earl of Warwick was appointed in the spring of 1274 as head of a commission, empowered to do justice on all transgressions of the peace, and Llewelyn was ordered to meet him at Montgomery Ford. But Llewelyn was busy at home, where his brother David had joined hands with Griffith ap Gwenwynwyn in a plot against him. Llewelyn easily crushed the conspiracy; David, after a feeble attempt to maintain himself in his own patrimony, took flight to England, and Griffith of Powys, driven from his dominions, was also obliged to seek the protection of Edward. ”
