b. ?1655, 1st s. of John Vaughan of Court Derllys by Rachel, da. of Sir Henry Vaughan, M.P., of Derwydd. educ. Jesus, Oxf. 23 May 1672, aged 16; G. Inn 1673, called 1680, bencher 1706. m. (lic. 12 July 1692) Arabella, da. of Sir Erasmus Philipps, 3rd Bt., M.P., of Picton Castle, Pemb., sis. of Sir John Philipps, 4th Bt., s.p. suc. uncle Sir Henry Vaughan, M.P., to Derwydd 1676.