But he is mainly remembered for his ‘iron ring’ of fortresses built in response to a further revolt spearheaded by Llywelyn in 1282.
Ond caiff ei gofio’n bennaf am ei ‘gylch haearn’ o amddiffynfeydd a godwyd mewn ymateb i wrthryfel pellach a hybwyd gan Llywelyn ym 1282.