Wales · Ruin
Llangibby Castle
Tregrug Castle (also called Llangibby Castle) is a large medieval rectangular-walled enclosure on a ridge in Monmouthshire, Wales. The site preserves the remains of a substantial curtain wall, a prominent gatehouse with D-shaped towers and the 'Lord's Tower'; the central bailey was once laid out as a medieval pleasance and the whole was later adapted as a landscape feature.
Its prime
1320
Today
Ruin
As it stood in 1320
The shape it held in its prime.
A nearly rectangular high stone curtain wall of finely cut ashlar encloses a vast central bailey measuring about 164 m by 78 m, surrounded by external banks and ditches on a wooded ridge. The bailey is entered at the south‑west through a large gatehouse flanked by two D‑shaped stone towers with projecting latrine turrets; to the north‑west a substantial multi‑storey Lord's Tower rises above the curtain line, the whole set against dense woodland.
Its story
The story of Llangibby Castle.
Tregrug, or Llangibby Castle, superseded a Norman motte-and-bailey first mentioned in 1262. The estate came to the de Clare family in 1245, and Bogo de Clare, third son of Richard de Clare, held it for some years before his death in 1294. An ambitious new residence enclosed in a high stone wall was begun in the early 14th century, probably by Gilbert de Clare; the estate then passed briefly to the Despensers, and it may have been Hugh Despenser who began the structure from which most of the standing ruins derive.
The scale is startling: the bailey, about 164 metres by 78, makes this the largest single-enclosure castle in England and Wales, entered through a huge gatehouse with two D-shaped towers similar in design to Beaumaris. Recent archaeological thinking suggests the castle's main function was recreational rather than defensive — a hunting lodge with gardens in the style of a late medieval pleasance, its latrine turrets finished in finely cut ashlar.
Fallen into disuse by the 16th century, Tregrug passed to the Crown and was sold by Queen Mary to the Williams family of Usk in 1554. Sir Trevor Williams, 1st Baronet, refortified and garrisoned it in the Civil War; slighted at the war's end, it was adapted as a landscape feature for New Llangibby Castle, the house the family built nearby at the century's close, with an avenue of Scots pines planted around 1707.
Step inside
7 places to explore in 1320.
The record describes 7 distinct spots at Llangibby Castle — including 2 interiors: gatehouse passage, gatehouse latrine turrets. Create your own photoreal reconstruction and walk through every one — more scenes means more photos, more angles and more rooms of the immersive experience.
Create History
Recreate Llangibby Castle with AI to explore it.
The artist rebuilds it as it stood in 1320 — a photoreal walk that belongs to you alone. Pay with coins, no subscription needed.
Recreate Castle to Explore →Whose castle
Clans who held Llangibby Castle.
The families that held Llangibby Castle for a decade or more across its history — follow a name to its clan.
de Clare
The estate came to the de Clares in 1245; Gilbert de Clare probably began the great walled residence in the early 14th century.
Held by the Williams family of Usk from 1554; Sir Trevor Williams refortified the castle in the Civil War.
