During the 17th century, Sir John Wynn, 5th Baronet inherited the Watstay Estate through his marriage to Jane Evans (daughter of Eyton Evans of Watstay), and renamed it the Wynnstay Estate. The gardens were laid out by Capability Brown.
In 1858 Wynnstay was destroyed by fire and was rebuilt on the same site.
After the house was vacated by the Williams-Wynn family in the mid-20th century, in favour of the nearby Plas Belan on the Wynnstay estate, it was bought by Lindisfarne College. When the school closed due to bankruptcy, the building was converted to flats and several private houses.
The house is a grade II* listed building. As at 2010, the gardens are in the process of refurbishment.
- Transcript of information from Picturesque Views of Seats of The Noblemen and Gentlemen of Great Britain and Ireland edited by F. O. Morris (published c.1880) 
- 1860 – Wynnstay Hall, Ruabon, Wales
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