Received from King Edward I of England the honour of knighthood on bringing him intelligence of the birth of his son, Edward of Caernarvon. He did homage for his lands in Wales to the young prince at Chester; but indignant at the sufferings of his countrymen under the English yoke, he meditated a revolt. Between the years 1316 and 1318, he attempted to form an alliance with Edward Bruce, the short-lived King of Ireland; letters passed between them, but without effect; but at length determined alone to free his country from the slavery to which he himself had probably contributed, he took arms in 1322, and for a while overran the country with resistless impetuosity. Finally, he was subdued, taken, and doubtless underwent the common fate of the gallant Cambrian insurgents. Sir Griffith bore "Gu., a chev., or, and a chief, erm." By his wife he had 8 daughters, his co-heirs. He also had an illegitimate son.103