Dwnn gives the following pedigree for the Griffith Vaughan of 1588: Griffith Vaughan, son of Richard, son of Rhys, son of William, son of Griffith Vaughan, esquire of the body to Henry VII, and third son of Griffith, son of Einion, son of Griffith, son of Llywelyn, son of Cynwrig, son of Osbwrn Wyddel. From the 16th cent. downwards to the end of the 18th cent. the pedigree can be seen in many printed and manuscript sources, e.g. quite conveniently in J. E. Griffith, Pedigrees (1914), 279. There is also a general account of Corsygedol and the Vaughans in Arch. Camb., vi (1875), 1-16; this account was edited and annotated by W. W. E. Wynne of Peniarth from a transcript by Angharad Llwyd (q.v.) from a Mostyn manuscript compiled in 1770 by William Vaughan (below). Various members of the family, as shown by Edward Breese in Kalendars of Gwynedd, served as high sheriffs of Merioneth (and some of Caernarvonshire), or as knights of the shire or Custodes Rotulorum. Richard Vaughan became constable of Harlech castle in July 1704, his nephew, Evan Lloyd Vaughan (d. 1791) becoming constable fifty years later.

WILLIAM VAUGHAN (d. 1633) was high sheriff of Caernarvonshire in 1613 and 1632; he rebuilt Plas Hen, Llanystumdwy, 1607, and the gate-house at Corsygedol, 1630. ‘He was a great friend of Ben Jonson, the poet, who made him a present of his works.’ (See also James Howell (q.v.) in Epistolae Ho-Elianae). His son RICHARD VAUGHAN (d. 1636) became well known in London as the abnormally stout Member of Parliament for Merioneth. He m. Anne, daughter of John Owen, Clenennau (q.v.). WILLIAM VAUGHAN (d. 1669) their son m. Anne, daughter of the house of Nannau (q.v.), and thus united two families which had already been on friendly terms. Their eldest son, GRIFFITH VAUGHAN, d. without issue in 1697; the second son, RICHARD VAUGHAN (d. 1734), maintained the line. By his wife Margaret, daughter of Sir Evan Lloyd of Bodidris, Denbs. (see the article on the family), he became the father of WILLIAM VAUGHAN (1707-1775) (below), whose wife, Catherine, daughter of Hugh Nanney, became eventual heiress of Nannau. Their only child was ANN VAUGHAN, who m. David Jones Gwynne, of Taliaris, Carms. She, the last heir in the direct line, d. 16 March 1758, leaving no issue. The last male representative was EVAN LLOYD VAUGHAN, Member of Parliament for Merioneth, brother to William Vaughan. Upon the death of Evan Lloyd Vaughan on 4 Dec. 1791, Corsygedol and the associated estates passed to his niece, Margaret, wife of Sir Roger Mostyn, bart. (see the article Mostyn).

Throughout the centuries, members of the family were patrons of Welsh literature and welcomed itinerant bards (see Mostyn MS. 165). As one might expect, some members of the group of bards known as ‘Phylipiaid Ardudwy’ (qq.v.), whose homes were near Corsygedol, wrote poems to various Vaughans. Siôn Phylip (d. 1620) wrote about sixteen, his son, Gruffydd Phylip (d. 1666), who was bardd teulu at Corysgedol, wrote about nineteen, whilst another son, Phylip Siôn Phylip (d. c. 1677), wrote one. William Phylip (d. Feb. 1670), who lived at Hendre-fechan, close to Corsygedol, helped Siôn Bryncir to write a cyngor to William Vaughan, nephew of Siôn Bryncir. One poem by Gruffydd Phylip has an interesting title — ‘I Wmffre Davies o Landy-frydogy Mon dros Rich: Vnô Gorsygedol i ofyn 100 o gywydde D[afydd] ap G[wilym].’ That some of the Vaughans collected manuscripts and books is an established fact. The following manuscripts, formerly at Mostyn Hall, Flints., but now in the National Library of Wales, were at Corsygedol — Mostyn MSS. 115, 130, 131, 144 (‘Llyfr Coch Nannau’), 145 (‘Llyfr Gwyn Corsygedol’), 147, 160, 162, 163 (‘Y Llyfr Gwyrdd’), 164 and 165 (this last an important volume from the family history standpoint). The literary tradition is continued in the 18th cent. in the person of William Vaughan (1707-1775), who was Member of Parliament for Merioneth from 1734 to 1768, lord-lieutenant and Custos Rotulorum of that county, and the first ‘Chief President’ of the Honourable Society of Cymmrodorion. Born in 1707, he attended schools in Chester and London and went to S. John's College, Cambridge. Huw Jones of Llangwm's anthology called Diddanwch Teuluaidd (London, 1763) is dedicated to William Vaughan, to whom there are numerous references in the correspondence of the Morris brothers of Anglesey. Diddanwch Teuluaidd includes ‘Caniad y Gôg i Feirionydd,’ the well-known poem by Lewis Morris, followed by an English version by William Vaughan. Vaughan's Welsh address in the Merioneth parliamentary election of 1747 is printed by E. Breese in Kalendars of Gwynedd.