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 0.2 m thick. It stands in a level field 640 m NW of Trefignath burial chamber.

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. Standing stones are often part of a larger cluster of monuments and their importance can further enhanced by their group value.

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

Source: Cadw

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