Ancient Monuments

History on the Ground

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Perthi-Duon Burial Chamber

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

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Latitude: 53.1761 / 53°10'34"N

Longitude: -4.276 / 4°16'33"W

OS Eastings: 247982

OS Northings: 366755

OS Grid: SH479667

Mapcode National: GBR 5H.3ZQQ

Mapcode Global: WH437.9F1G

Entry Name: Perthi-Duon Burial Chamber

Scheduled Date:

Source: Cadw

Source ID: 2527

Cadw Legacy ID: AN059

Schedule Class: Religious, Ritual and Funerary

Category: Chambered tomb

Period: Prehistoric

County: Isle of Anglesey (Ynys Môn)

Community: Llanidan

Traditional County: Anglesey


The monument comprises the remains of a chambered tomb, dating to the Neolithic period (c.4,400 BC - 2,900 BC). Chambered tombs were built and used by local farming communities over long periods of time. There appear to be many regional traditions and variations in shape and construction.

The site comprises a ruined burial chamber, the vestiges of which are a capstone c.2.5 m long and 1.8 m wide lying on two fallen stones which are probably collapsed uprights. There are other stones which have been placed around the capstone.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual. The monument is an important relic of a prehistoric funerary and ritual landscape and retains significant archaeological potential, with a strong probability of the presence of both intact burial or ritual deposits and environmental and structural evidence, including a buried prehistoric land surface. Chambered tombs may be 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 areas around them within which related evidence may be expected to survive.

Source: Cadw

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