Richard Garnett, Dictionary of National Biography… (1899)
“ VAUGHAN, HENRY, ‘Silurist’ (1622–1695) , poet, was born at Newton-by-Usk in the parish of Llansaintffraed, Brecknockshire (Anthony à Wood MSS. Ff. 39, f. 216) . He and his twin-brother Thomas [q. v.] were born on 17 April 1622 (Sloane MS. 1741) . Their father, Thomas Vaughan (d. August 1658) , was the representative of an ancient and honourable Welsh family, the Vaughans of Tretower Castle, descended from Sir Roger Vaughan of Bredwardine, who had fallen at Agincourt. Vaughan's mother was Denys Gwillims, heiress of Newton. ”
