Sir Robert OwenWilliam and Katherine had a large family but their heir was Sir Robert Owen of (1658-1698). As well as the estates of Clennenau and Porkington (Brogyntyn), he inherited through his mother the Anwyl library, in which there was a copy of a Shakespeare ‘Folio’. Robert was knighted in 1678 and held several local public offices; he was also Member of Parliament for Merioneth from 1681 to 1685 in the 5th Parliament of Charles II and member for the Carnarvonshire boroughs in the Convention Parliament (1688-9) and in the 2nd and 3rd Parliaments of William and Mary. He held the latter position at the time of his death. In 1683 he married Margaret (b. 1663), eldest daughter of Owen Wynne and heiress to the substantial estates of Glyn in Merionethshire, Sylfaen and Ystumcegid. A little later he also acquired a moiety of Nant in Flintshire by a settlement with his wife's family. Unfortunately, Sir Robert Owen died prematurely in 1698, leaving massive debts.
There is the suggestion of a link with the Wynns (aka Wynnes) of Glyn in that my grandfather was Reginald Wynn Owen and his three children were all given the middle name Wynn, as were five other descendants of James Owen. In addition, the house that Reginald designed for his sister Mary was called “Wynnfield” and she subsequently lived in a house called Glyn.