At the moment of the departure of John of Brittany a sudden insurrection in Wales frustrated Edward’s plans. All Wales was ripe for revolt. In the principality the Cymry resented English rule, and the sulky marchers stood aloof in sullen discontent, while their native tenants, seeing in the recent humiliation of Gloucester and Hereford the degradation of all their lords, lost respect for such powerless masters. Both in the principality and in the marches, Edward’s demand for compulsory service in Gascony was universally regarded as a new aggression. The intensity of the resistance to his demand can be measured by the general nature of the insurrection, and by the admirable way in which it was organised. As by a common signal all Wales rose at Michaelmas, 1294. One Madog, probably a bastard son of Llewelyn, son of Griffith, raised all Gwynedd, took possession of Carnarvon castle, and closely besieged the other royal strongholds. In west Wales a chieftain named Maelgwn was equally successful in Carmarthen and Cardigan. The marches were in arms equally with the principality. In the north, Lincoln’s tenants in Rhos and Rhuvoniog besieged Denbigh, and threatened the king’s fortresses in Flint. Maelgwn’s sphere of operations included the earldom of Pembroke, while Brecon rose against Hereford, and Glamorgan against Gilbert of Gloucester. Morgan, the leader of the Glamorganshire rebels, loudly declared that he did not rebel against the king but against the Earl of Gloucester. With the beginning of winter the state of Wales was more critical than in the worst times of the winter of 1282.