History

Fort Williamsburg was built by Sir Thomas John Wynn in 1761 following his election as MP for Caernarvonshire and his appointment as Constable of Caernarvon Castle and Lord Lieutenant making him responsible for the county's militia. He was a notable eccentric of his day and he carried out these responsibilities in an unparalleled way, by building his own private garrison within the park at the family home.

On the day of George III's coronation (September 1761) Wynn founded 'The Society or Garrison at Fort Williamsburg in Glynllifon Park' and he also created 'The Holy Order of Sisterhood United, Connected and Regulated with the Free, Firm and Friendly Garrison of Williamsburg' - a unique volunteer organisation. The intention was for the garrison to comprise a Commander in Chief, a Governor, Lieutenant-Governor, 100 Officers, an Archdeacon, 24 chaplains, 24 honorary members and an unlimited number of volunteers. Although the officers were not part of the regular army they wore full and colourful uniform all at Wynn's expense.

The Caernarvonshire Militia was mobilised for a year while there was a threat of French invasion but even after the 1763 Treaty of Paris the muster books show that the Williamsburg garrison continued to meet. However, having realised that Fort Williamsburg had limited strategic capability, and with the American War of Independence once again threatening British shores, Wynn began work on Fort Belan begun in 1775.

The tower is said by RCAHMW to be one of the additions made in 1773-76. Further alterations are said to have been carried out between 1832 and 1840. Modern restoration.

Exterior

The tower is set on a motte-like mound and has wide views across the estate and out to sea. It is a 2-stage octagonal tower built of brick with scribed cement render and has a crenellated parapet and a square vice tower to south. There are band courses above each floor; the 1st floor has replaced semicircular headed horned sash windows and the ground floor has square-headed openings including a doorway to north-west and another to the stair tower. Over the former, main, doorway is a stone plaque inscribed 'Williamsbourg Fort'.

The fort is roughly square with redans to the four corners and with surrounding ditches and revetment walls.

Interior

Much restored and without significant individual features. Winding timber stairs rising to single octagonal chamber at 1st floor and on to roof level.

Reasons for Listing

Listed grade II* as a key building within a rare and remarkable British example of an C18 private fortification.

Group value with other listed items at Fort Williamsburg.

External Links

• Cadwr Listing
• Wikidata Q17744393

External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.

Recommended Books

• 
  Department for Communities Listed Historic Buildings of Northern Ireland: Information Guide for the 2nd Survey of Historic Buildings
• 
  Kent: West and the Weald: The Buildings of England (Pevsner Architectural Guides: Buildings of England)
• 
  Farrow & Ball How to Decorate: Transform your home with paint & paper
• 
  Hampshire: Winchester and the North (The Buildings of England) (Pevsner Architectural Guides: Buildings of England)
• 
  Old House Eco Handbook: A Practical Guide to Retrofitting for Energy-Efficiency & Sustainability
• 
  Listed Buildings: The Law and Practice of Historic Buildings, Ancient Monuments and Conservation Areas