The Williamses of Llangibby traced their descent to Howell Gam ap David, lord of Penrhos, their surname becoming settled in the mid-sixteenth century. The family’s position in Monmouthshire was secured by Williams’s grandfather, Roger, who used his connection with the 1st earl of Pembroke to obtain former church lands, subsequently purchasing the manor of Tregrug.
It is curious that Williams did not appear on the county bench before 1620. His elevation to the magistracy roughly coincided with his return to Parliament and was probably achieved with the assistance of his wife’s family and the 3rd earl of Pembroke. He left no trace on the records of the 1621 Parliament; he cannot have been the ‘Mr. Willyams’ named to the committee for the bill for catechizing children (16 May), as he had been knighted during the Easter recess.
In May 1624 Williams exhibited a bill in Star Chamber against several of his tenants in a long-running dispute over common rights at Tregrug. The defendants claimed that he was ‘greatly allied’ within the county, using connections with magistrates such as his brother-in-law, Nicholas Kemeys*, to overawe the disgruntled tenants.
