Tensions between the Welsh and the English persisted and spilled over in 1400 with the outbreak of the Glyndŵr Rising. It is uncertain what part the castle played in the conflict, but it seems to have survived intact. In 1416, the castle passed through Isabel le Despenser in marriage to her first husband Richard de Beauchamp, the earl of Worcester, and then to her second husband, Richard Beauchamp, the earl of Warwick. Isabel and her second husband invested heavily in the castle, conducting repairs and making it suitable for use as their main residence in the region. The castle passed to Richard Neville in 1449 and to Jasper Tudor, the earl of Pembroke, in 1486.