High Sheriff of Merionethshire in 1617.
Lewis Gwyn figures quite prominently in the work of some bards who were contemporary with him, particularly Rhisiart Phylip ... who wrote two cywyddau to a drinking vessel (‘ffiol frech’) which was at Dolau Gwyn at that time, to ask John Vaughan of Caer-gai to give a greyhound to Lewis Gwyn, an elegy on the death of Lewis Gwyn and on the death of his daughter (and coheiress), Gwen Gwyn, who was the first wife of Lewis Lloyd, Rhiwedog , near Bala.
Dolau Gwyn was built by Lewis Gwyn, probably just before 1620. The house has the initials L.G.A.G. with the date 1620, these standing for Lewis Gwyn and Ann Gwyn. Elsewhere are the initials of G.N.A.N., and the date 1656 — for Griffith Nanney, and Ann his wife. 2