The castle declined in importance thereafter, but was attacked in March 1405 by Welsh forces led by Rhys Gethin and including Gruffudd, son of Owain Glyndŵr.
He is on record during May and June as taking the 'Three Castles'—Grosmont, Skenfrith, and Whitecastle in South Wales, which belonged to Prince Edward.
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William de Braose, (or William de Briouze), 4th Lord of Bramber (1144/1153 – 9 August 1211), court favourite of King John of England, at the peak of his power, was also Lord of Gower, Abergavenny, Brecknock, Builth, Radnor, Kington, Limerick, Glamorgan, Skenfrith, Briouze in Normandy, Grosmont, and White Castle.