The heir of William Wynn and Catherine ( Anwyl ) was ROBERT WYNN (d. 1670 ), of Glyn and Ystumcegid , high sheriff of Merioneth in 1656-7 and 1668-9 . By his wife, Catherine (d. 1675 ), daughter and co-heiress of Robert Owen of Ystumcegid , he was the father of OWEN WYNN (d. 1682/3 ), of Glyn and Ystumcegid , who m. Elizabeth , daughter and heiress of Robert Mostyn , of Nant, Flints. , the issue of the marriage being two daughters, (1) MARGARET (d. 1727 ), who m. Sir ROBERT OWEN (d. 1698 ) , of Clenennau and Brogyntyn who was Member of Parliament for Merioneth , 1681-85 , and was elected for Caernarvon boroughs in 1698 ( Sir Robert Owen was grandson of Sir John Owen of Clenennau , 1600 — 1666 q.v. , the Royalist soldier ; through his mother, Catherine , daughter and heiress of Lewis Anwyl , Park , Llanfrothen , he inherited the Anwyl library , included in which was a copy of a Shakespeare ‘ Folio ,’ lately at Brogyntyn ), and (2) Catherine (d. 1700 ), who became the first wife of Peter Pennant , of Bychton, Flints.

Lady ( Margaret ) Owen and her husband were neighbours of Ellis Wynne (q.v.) , author of Gweledigaethau y Bardd Cwsc , who wrote to the husband on 16 Sept. 1697 soliciting his help in regard to difficulties which had arisen in regard to the estate of the writer's uncle, John Jones , of Uwchlaw'r Coed , and, on 9 Nov. 1706 , to lady ( Margaret ) Owen , by then a widow, asking her and her son, William Owen , to let him and his parishioners of Llandanwg have the old Shire Hall at Harlech for conversion into a chapel-of-ease; both letters are in the Brogyntyn collection in N.L.W. — see Ellis Wynn: Dauganmlwyddiant , published by the National Library in 1934 .

The heir of Sir Robert Owen and lady ( Margaret ) Owen was WILLIAM OWEN (d. 1768 ) who m. Mary , daughter of Henry Godolphin , dean of S. Paul's and provost of Eton (see Godolphin papers in Brogyntyn collection in N.L.W. , and an account in Etoniana , 1939 ), leaving as (eventual) heiress a daughter, another MARGARET OWEN , who m. Owen Ormsby (d. 1804 ), of Willowbrook , Co. Sligo , Ireland (he, incidentally, had a Welsh mother, Hannah Wynne , a descendant of the Wynns of Gwydir ); the issue of the marriage was MARY ORMSBY (d. 1869 ), heiress of Glyn , Clenennau , and Brogyntyn . By her marriage ( 1815 ) to William Gore (d. 1860 ), Mary Jane Ormsby became the mother of JOHN ORMSBY ( 1816 – 1876 ), who was created baron Harlech 11 Jan. 1876 .