Ancient Monuments

History on the Ground

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Castell Glas Castle Mound

A Scheduled Monument in Gaer (Y Gaer), Newport (Casnewydd)

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Latitude: 51.5665 / 51°33'59"N

Longitude: -3.0087 / 3°0'31"W

OS Eastings: 330180

OS Northings: 185776

OS Grid: ST301857

Mapcode National: GBR J5.DFX7

Mapcode Global: VH7BC.SWSH

Entry Name: Castell Glas Castle Mound

Scheduled Date:

Source: Cadw

Source ID: 2414

Cadw Legacy ID: MM190

Schedule Class: Defence

Category: Motte

Period: Medieval

County: Newport (Casnewydd)

Community: Gaer (Y Gaer)

Built-Up Area: Newport

Traditional County: Monmouthshire


The monument comprises the remains of a motte and ditch, dating to the medieval period (c. 1066 -1540 AD). A motte is a large rectangular mound of soil and/or stone, usually surrounded by either a wet or dry ditch, and surmounted by a tower constructed of timber or stone. The earth mound is about 1.5m high and 35m by 25m in size.

Little is known of its history, but it was sold in 1622 and by 1645 was said to have “disappeared”. In the later Middle Ages, the castle belonged to the Earls of Lancaster and when Coxe visited it in 1800. The remains included a range of medieval stone buildings such as, a square tower and a possible hall block with a “fine Gothic entrance”, a “large fireplace” and “several Gothic doors”.

The monument is of national importance for its potential to enhance our knowledge of medieval defensive practices. The monument is well-preserved and an important relic of the medieval landscape. It retains significant archaeological potential, with a strong probability of the presence of both structural evidence and intact associated deposits. The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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