Ancient Monuments

History on the Ground

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Ty-Mawr Standing Stone

A Scheduled Monument in Holyhead (Caergybi), Isle of Anglesey (Ynys Môn)

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Latitude: 53.2967 / 53°17'48"N

Longitude: -4.6214 / 4°37'16"W

OS Eastings: 225396

OS Northings: 380957

OS Grid: SH253809

Mapcode National: GBR GMYZ.RVX

Mapcode Global: WH31B.ZDJH

Entry Name: Ty-Mawr Standing Stone

Scheduled Date:

Source: Cadw

Source ID: 530

Cadw Legacy ID: AN012

Schedule Class: Religious, Ritual and Funerary

Category: Standing stone

Period: Prehistoric

County: Isle of Anglesey (Ynys Môn)

Community: Holyhead (Caergybi)

Built-Up Area: Trearddur

Traditional County: Anglesey


The monument comprises the remains of a standing stone, which probably dates to the Bronze Age. The standing stone is 2.5 m high, 1.5 m wide at the base and 0.4 m thick. It stands on a local high point, in a gently undulating field 640 m NW of Trefignath burial chamber. The views are good all round, but especially good of Holyhead Mountain.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. It is an important relic of a prehistoric funerary and ritual landscape and retains significant archaeological potential. There is a strong probability of the presence of intact burial or ritual deposits, together with environmental and structural evidence. The standing stone is part of a larger cluster of prehistoric monuments and its importance is further enhanced by this group value.

The scheduled area comprises a circular area centred on the stone measuring 6m in diameter, within which related evidence may be expected to survive.

Source: Cadw

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