Ancient Monuments

History on the Ground

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Tyddyn Mawr, standing stone to SSW of

A Scheduled Monument in Llanystumdwy, Gwynedd

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Latitude: 52.9743 / 52°58'27"N

Longitude: -4.3383 / 4°20'17"W

OS Eastings: 243084

OS Northings: 344441

OS Grid: SH430444

Mapcode National: GBR 5F.JNM2

Mapcode Global: WH445.BHCP

Entry Name: Tyddyn Mawr, standing stone to SSW of

Scheduled Date: 25 February 2005

Source: Cadw

Source ID: 4165

Cadw Legacy ID: CN384

Schedule Class: Religious, Ritual and Funerary

Category: Standing stone

Period: Prehistoric

County: Gwynedd

Community: Llanystumdwy

Traditional County: Caernarfonshire


The monument comprises a fine standing stone, probably dating to the Bronze Age (c.2300 BC - 800 BC) and situated within enclosed pasture about 300m to the SSW of Tyddyn Mawr. The standing stone measures 1.8m in height, 0.8m in thickness from NE to SW by 0.7m in width. Several packing stones are visible around its base.

The monument is of national importance for its potential to enhance our knowledge of prehistoric ritual practices. The monument is well preserved and is an important relic of a prehistoric funerary and ritual landscape. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits.

The area to be scheduled comprises the remains described and an area around them within which related evidence may be expected to survive. It is circular and measures 10m in diameter.

Source: Cadw

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