Ancient Monuments

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Dinas Cadnant Hillfort

A Scheduled Monument in Menai Bridge (Porthaethwy), Isle of Anglesey (Ynys Môn)

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Latitude: 53.2378 / 53°14'15"N

Longitude: -4.1711 / 4°10'16"W

OS Eastings: 255198

OS Northings: 373393

OS Grid: SH551733

Mapcode National: GBR 5N.016P

Mapcode Global: WH540.WWX7

Entry Name: Dinas Cadnant Hillfort

Scheduled Date:

Source: Cadw

Source ID: 261

Cadw Legacy ID: AN048

Schedule Class: Defence

Category: Hillfort

Period: Prehistoric

County: Isle of Anglesey (Ynys Môn)

Community: Menai Bridge (Porthaethwy)

Built-Up Area: Menai Bridge

Traditional County: Anglesey


A range of later Prehistoric style settlement features are set across a rocky ridge or platform, extending over an area 148m north-west to south-east by 100m. These can be resolved into three discrete clusters, each apparently constituting a separate enclosed settlement.

At the craggy north-western end of the site is a cluster of perhaps five roundhouses, generally about 6.5m across, with a two cell rectangular structure. These appear to have been set within a walled enclosure of perhaps 65m by 35m, the wall partly following the edge of the crags. To the south-east is a rectangular complex, roughly 50m north-south by 30m, consisting of two rows of oblong compartments or buildings either side of a long central court.

On the south-east is a group of three roundhouses set within a roughly 30m by 22.5m walled court in the shadow of the crags fringing the ridge on this side.

The monument is of national importance for its potential to enhance our knowledge of prehistoric/Romano British 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.

Source: Cadw

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