Clan Rising
Dún Dealgan Motte today

Ireland · Partial ruin

Dún Dealgan Motte

Móta Dhún Dealgan

Dún Dealgan Motte is a medieval motte and National Monument on a ridge immediately northwest of Dundalk. The site preserves an earthwork motte built in the Norman period atop an earlier Gaelic fort hill; a southeast bailey and an internal souterrain are recorded. The place is associated in tradition with Cú Chulainn and later had an 18th-century castellated folly built on the summit.

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Photograph via Wikimedia Commons

Its prime

1210

Today

Partial ruin

As it stood in 1210

What Dún Dealgan Motte looked like in its prime.

A broad, turf-covered motte about 68 m across at the base and roughly 10 m high sits on a ridge overlooking the Castletown River and the northern approach. In its Norman-phase prime (c.1210) the summit was occupied by a wooden tower set within a continuous timber palisade; a bailey lay to the southeast defined by low earthen banks. The mound rises from grassy slopes and is backed by lines of trees along the ridge.

Its story

The story of Dún Dealgan Motte.

An ancient Gaelic dún stood on this ridge by Dundalk long before the Normans: legend claims it as the birthplace of Cú Chulainn, who bases himself here in the Táin Bó Cúailgne, and the Annals of the Four Masters place a battle here in 500 AD. A Z-shaped souterrain, 17 m long, was dug into the hill in the Gaelic period.

After the Norman invasion a motte-and-bailey castle rose on the hill, an earth mound some 68 m across and 10 m high, its wooden tower commanding the Castletown River and the northern route from Ulster. It was a stronghold of Hugh de Lacy, 1st Earl of Ulster, in 1210, but he abandoned it when pursued northwards by King John.

Step inside

5 places to explore in 1210.

The record describes 5 distinct spots at Dún Dealgan Motte, including 1 interior: entrance to the z-shaped souterrain. Create your own photoreal reconstruction and explore every one, more scenes means more rooms, more angles, and more of the place to stand in.

Approach from the base of the ridgeSummit within the timber palisadeSoutheast bailey (interior of bailey)Entrance to the Z-shaped souterrainView from summit toward the Castletown River

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Nearby

Landmarks within reach of Dún Dealgan Motte.

Brú na Bóinne, IrelandAncient siteBrú na Bóinne36 km away

Questions about Dún Dealgan Motte

What is the history of Dún Dealgan Motte?

Dún Dealgan Motte has Gaelic origins and became a Norman motte-and-bailey stronghold in the 12th or 13th century. An earlier Gaelic dún and a 17-metre Z-shaped souterrain occupied the ridge before the Norman castle was raised. In 1210 it was a stronghold of Hugh de Lacy, 1st Earl of Ulster, who abandoned it when pursued northwards by King John.

What is inside Dún Dealgan Motte?

Inside Dún Dealgan Motte, the documented feature is the entrance to a Z-shaped souterrain. The passage was dug into the hill during the Gaelic period and is 17 metres long. The surviving site also includes the motte summit and the southeast bailey, although these are open earthwork spaces rather than described rooms.

Why was Dún Dealgan Motte built, and what was it used for?

Dún Dealgan Motte was built as a Norman motte-and-bailey stronghold overlooking the Castletown River and the northern route from Ulster. Its mound supported a wooden tower within a continuous timber palisade, while a southeast bailey formed part of the defensive complex. An 18th-century castellated folly was later built on the summit.

Where is Dún Dealgan Motte?

Dún Dealgan Motte is immediately northwest of Dundalk, on a ridge overlooking the Castletown River. It lies west of Mount Avenue and near the northern approach to the town. The site is associated administratively with Dundalk.

What did Dún Dealgan Motte look like in its prime?

At its prime around 1210, Dún Dealgan Motte was a broad, turf-covered earth mound about 68 metres across at the base and roughly 10 metres high. A wooden tower stood on the summit inside a continuous timber palisade, with a southeast bailey enclosed by low earthen banks. It occupied a ridge above grassy slopes and the Castletown River.

Is Dún Dealgan Motte still standing or is it a ruin?

Dún Dealgan Motte survives in partial ruin. The earthwork motte, its southeast bailey and the internal souterrain are recorded, while the later buildings on the summit did not survive intact. Patrick Byrne’s Gothic house, begun in 1780, was damaged in the 1798 Rebellion, leaving only a castellated tower known as Byrne’s Folly; the site was later further damaged by fire.

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