Ancient Monuments

History on the Ground

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Castell Prysor

A Scheduled Monument in Trawsfynydd, Gwynedd

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Latitude: 52.9149 / 52°54'53"N

Longitude: -3.8487 / 3°50'55"W

OS Eastings: 275788

OS Northings: 336875

OS Grid: SH757368

Mapcode National: GBR 62.NFKN

Mapcode Global: WH55Q.VZGR

Entry Name: Castell Prysor

Scheduled Date:

Source: Cadw

Source ID: 3206

Cadw Legacy ID: ME045

Schedule Class: Defence

Category: Motte & Bailey

Period: Medieval

County: Gwynedd

Community: Trawsfynydd

Traditional County: Merionethshire


A motte and bailey with the foundations of rectangular structures and enclosures NE and W of the motte.

The top of the motte stands some 9 m above the level of the bailey, and is 12 m in diameter. The top has been severely damaged by trenches dug across; the principal trench is 6 m across and nearly 2 m deep.

The body of the motte is mainly of stone, and revetted stonework is still visible on the sides of the motte, although blackthorn obscures much of this work. The bailey also makes use of natural outcrops of rock, and is defended on the W by a bank 3 m wide and 0.6 m high. There is a small, rock-cut pool in the SW corner of the bailey.

The monument is of national importance for its potential to enhance our knowledge of medieval settlement and defence. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structures themselves may be expected to contain archaeological information concerning chronology and building techniques.

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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