Criccieth Castle a distant relation of Llywelyn ap Gruffudd, began an uprising against English rule that spread quickly through Wales. Several English-held towns were razed and Criccieth (along with Harlech Castle and Aberystwyth Castle) were besieged that winter. Its residents survived until spring when the castle was resupplied. In the 14th century the castle had a notable Welsh constable called Hywel ap Gruffydd, known as Howell the Axe, who fought for Edward III at the Battle of Poitiers in 1356. The castle was used as a prison until 1404 when Welsh forces captured the castle during the rebellion of Owain Glyndŵr. The
Hywel ab Owain Gwynedd of Anarawd's wedding to Owain's daughter. Owain followed a diplomatic policy of binding other Welsh rulers to Gwynedd through dynastic marriages, and Cadwaladr's border dispute and murder of Anarawd threatened Owain's efforts and credibility. As ruler of Gwynedd, Owain stripped Cadwaladr of his lands, and dispatched Hywel to Ceredigion where he burned Cadwaladr's castle at Aberystwyth. Cadwaladr fled to Ireland and hired a Norse fleet from Dublin, bringing the fleet to Abermenai to compel Owain to reinstate him. Taking advantage of the brotherly strife, and perhaps with the tacit understanding of Cadwaladr, the marcher lords mounted incursions into Wales. Realizing