His son, also Sir Henry Williams, was also MP for Breconshire (1628–29).
In August 1787 he had been appointed senior justice of the Welsh counties of Breconshire, Glamorgan, and Radnorshire.
Thomas Rees - DD 1862, Welsh Congregational Minister in Breconshire, Monmouthshire and Glamorganshire.
He was appointed Constable and Lieutenant of Breconshire, Chamberlain of Carmarthenshire and Cardiganshire, Seneschall and Chancellor of Haverfordwest, Rouse and Builth, Justiciar of South Wales, and Governor of all Wales.
Herefordshire initially utilised subscription asylum premises within the Hereford General Infirmary site and following the 1845 act entered into agreement with the Welsh counties of Monmouthshire, Radnorshire and Breconshire to construct the Joint counties premises at Abergavenny.