Gwyn was the son of John Gwyn, Sheriff of Anglesey in 1542 and 1577, and grandson of Rice Gwyn, who reputedly led 300 men to fight for Henry Tudor at Bosworth and for his services became sheriff of Anglesey for life.
Apart from acting as legal counsel in Norfolk, Gwyn was active in the administration of the Inner Temple. He occupied various minor offices before being appointed Lent reader in 1606, and ten years later served as treasurer. His status was such that his son, Rice, was admitted by a special decree in 1611.
In 1614 Gwyn, now aged 60, stood for election to Parliament at both Thetford and Norwich. He failed dismally at Thetford, where he received only one vote, but gained the second seat at Norwich.
in the case of pontage, where a man builds a bridge for the common good, the king might grant that party a pontage because it was for the profit and not for the hurt of the subject. That the book of 13 H[enry] IV is no more but that the king had such a custom; but whether the king had it given him by the town, that’s not known - neither does it make that the king did impose it.
Procs. 1614 (Commons), 286.
Gwyn was also appointed to two committees during the Parliament, one to enfranchise county Durham (31 May) and another to investigate the problem of legislating in respect of old debts (31 May).
Gwyn, who was created a serjeant-at-law in 1623, drafted his will on 17 Dec. 1629, in which he complained that he was ‘subject to many infirmities’. He settled his manor of Fakenham on his son, Rice, on condition that his widow was to live at Fakenham for the remainder of her life. His grandson, also named Rice, was bequeathed his law books ‘if it please God to direct him to the study of the Common Law’. Gwyn left 40s. for the repair of Fakenham church, £4 to the poor of the town and 40s. annually for the next three years. He added that he was ‘ever minded to have increased [these amounts] to a greater sum but that I found them unruly and evil disposed people, not regarding me or anything I did or could do for them’. His remarks probably relate to a dispute between him and various malefactors in Fakenham, who had pulled down his enclosures.
