The Llangibby estate passes into the hands of the Addams-Williams family when the original Williams line dies out.
The revolt quickly spread through Glamorgan and Gwent; Kenfig castle was sacked, as was the castle at Llantrisant, and several others were attacked, including St Georges-super-Ely, Llangibby and Dinefwr Castle.
He was the leader of the Glamorgan insurgents during the rising of Madog ap Llywelyn in 1294-5; under his leadership, the Welsh captured castles at Kenfig, Llangibby, and Morlais.
The Williams Baronetcy, of Llangibby in the County of Monmouth, was created in the Baronetage of England on 14 May 1642 for Trevor Williams.