b. ?1699, 3rd s. of Sir William Williams, 2nd Bt., M.P., of Llanforda, Salop and Glascoed, Denb. by Jane, da. and h. of Edward Thelwall of Plasyward, Denb.; bro. of Robert Williams and Watkin Williams Wynn. educ. Balliol, Oxf. 11 July 1717, aged 18. m. (2) Charlotte, da. and coh. of Richard Mostyn of Penbedw, 1s.; (3) bef. 1742, Annabella, da. and h. of Charles Lloyd of Drenewydd, Salop, 4s. 4da. Inherited estate of Penbedw from 2nd w.