Myths and Legends of Northern Ireland: From Finn McCool to the Children of Lir

Northern Ireland’s landscape is saturated with story. Every hill, lough, and headland has a tale attached — sometimes several, layered over centuries. These aren’t quaint folk stories dusted off for tourists. For most of Irish history, mythology was history. The stories of Finn McCool, Cú Chulainn, and the Children of Lir weren’t entertainment; they were explanations. Why does the Causeway Coast look like that? Because a giant built it. Why is Lough Neagh so large? Because Finn McCool scooped up a lump of earth and threw it at a Scottish rival (it landed in the Irish Sea and became the Isle of Man).

Modern geology has its own explanations, of course. But the mythological ones are often better stories, and they reveal how people understood and related to a landscape that was — and remains — genuinely dramatic.

This guide covers the major myths and legends connected to Northern Ireland, the places where they’re set, and what (if anything) lies behind them.

Finn McCool and the Giant’s Causeway

The most famous legend in Northern Ireland, and the one most visitors encounter first.

The Story

Finn McCool (Fionn mac Cumhaill in Irish) was a giant who lived on the north Antrim coast. Across the sea in Scotland lived another giant, Benandonner, who was bigger, meaner, and constantly taunting Finn. The taunts eventually became intolerable, so Finn built a causeway of stone columns across the sea to Scotland so he could cross over and fight Benandonner.

But when Finn arrived in Scotland — or, in some versions, when Benandonner started crossing to Ireland — Finn realised that Benandonner was far larger than he’d imagined. Finn fled back to Ireland in a panic.

Here the story diverges depending on who’s telling it, but the most popular version involves Finn’s wife, Oonagh (or Úna). She disguised Finn as a baby, wrapping him in blankets and placing him in an enormous cradle. When Benandonner arrived and saw the “baby,” he reasoned that if the child was this large, the father must be truly enormous. Terrified, Benandonner fled back to Scotland, ripping up the causeway behind him so Finn couldn’t follow.

The remains of the causeway are what we see today — the 40,000 interlocking basalt columns on the Antrim coast. And on the Scottish side, similar basalt formations on the island of Staffa (including Fingal’s Cave, named for the same character) are the other end of the destroyed causeway.

The Real Place

The Giant’s Causeway is a UNESCO World Heritage Site and Northern Ireland’s most visited natural attraction. The basalt columns — formed by volcanic activity roughly 60 million years ago — really do look like they were built by a giant. The hexagonal columns, some as tall as 12 metres, fit together with an uncanny regularity that invites mythological explanation.

The connection between the Causeway and Staffa is geologically real. Both were formed by the same volcanic event. The ancient storytellers noticed the same rock formations on both sides of the sea and concluded, reasonably enough, that they were once connected.

Finn McCool in the Wider Tradition

Finn McCool is not exclusively a Northern Irish figure. He’s a pan-Irish and Scottish character — the leader of the Fianna, a band of warriors who appear across Irish and Scottish Gaelic mythology. The Fenian Cycle, one of the four great cycles of Irish mythology, tells his story. He appears as everything from a young trickster to a wise old warrior, depending on the tale. But his association with the Causeway is his most famous appearance, and it’s Northern Ireland that claims him most visibly.

Cú Chulainn: The Hound of Ulster

If Finn McCool is Northern Ireland’s most famous giant, Cú Chulainn is its most famous hero — and a far more complex figure.

The Story

Cú Chulainn (pronounced roughly “Koo Hullin”) was born Sétanta, the son of the god Lugh and a mortal woman, Deichtine. As a boy, he killed the fierce guard dog of Culann the smith, and offered to take the dog’s place until a replacement could be raised. He became Cú Chulainn — the Hound of Culann.

He grew into the greatest warrior of the Red Branch Knights, the military order serving the King of Ulster at Emain Macha (now Navan Fort, near Armagh). His battle frenzy, the ríastrad, transformed him into something barely human — a distorted, terrifying figure who could not tell friend from foe.

The centrepiece of the Cú Chulainn legend is the Táin Bó Cúailnge — the Cattle Raid of Cooley. Queen Medb (Maeve) of Connacht invaded Ulster to steal a prized bull, the Brown Bull of Cooley. The Ulster warriors were incapacitated by a curse, and the teenage Cú Chulainn single-handedly held the border, fighting a series of single combats at a ford (traditionally identified with various river crossings in County Louth and south Armagh).

The most tragic of these combats was against his foster-brother and closest friend, Ferdia. They fought for four days, and Cú Chulainn killed Ferdia with his special weapon, the Gáe Bolga. His grief was devastating — one of the great tragic moments in Irish literature.

Cú Chulainn died young, as prophecy demanded. Mortally wounded, he tied himself to a standing stone so he would die on his feet, facing his enemies. His enemies only dared approach after a raven — the symbol of the war goddess Morrígan — landed on his shoulder, confirming he was dead.

Places Connected to Cú Chulainn

Navan Fort (Emain Macha), near Armagh — the seat of the Kings of Ulster in the legends, and a real archaeological site. A large circular enclosure on a hilltop, it was an important ceremonial site from the Bronze Age. The visitor centre tells the story.
The Cooley Peninsula (County Louth, just across the border in the Republic) — the setting for the Cattle Raid.
Various river crossings in south Armagh and north Louth — traditionally identified as the fords where Cú Chulainn fought his single combats.

Political Dimensions

Cú Chulainn is one of the most politically claimed figures in Irish mythology. He appears in murals on both sides of Belfast’s peace walls. Republicans claim him as an Irish hero who defended his homeland against invaders. Loyalists claim him as an Ulster hero who defended Ulster against the rest of Ireland. Both readings are selective, and both are deeply felt. You can see Cú Chulainn murals in the Belfast street art and murals guide.

The Children of Lir

This is the saddest story in Irish mythology, and one of the most beautiful.

The Story

Lir was a chief of the Tuatha Dé Danann — the mythological race who ruled Ireland before the Celts. He had four children: Fionnuala, Aodh, Fiachra, and Conn. After the death of their mother, Lir married her sister, Aoife. But Aoife grew jealous of the children and cast a spell transforming them into four white swans, condemned to spend 900 years on the waters of Ireland — 300 years on Lough Derravaragh in Westmeath, 300 years on the Sea of Moyle (the strait between Ireland and Scotland, off the Antrim coast), and 300 years on the Atlantic waters off Erris in County Mayo.

The 300 years on the Sea of Moyle were the cruelest. The children, in swan form, endured Atlantic storms, freezing cold, and isolation on the open water between Ireland and Scotland. Fionnuala, the eldest, sheltered her brothers under her wings during the worst storms.

The spell would only break when a bell rang across the land — the bell of Christianity. When St. Patrick (or, in some versions, another early saint) arrived in Ireland and the bells of the new faith were heard, the swans regained human form. But 900 years had passed. They were ancient, withered, and died almost immediately — but not before being baptised and, in the Christian overlay of the story, achieving salvation.

Northern Ireland Connections

The Sea of Moyle — the stretch of water between the Antrim coast and Scotland — is the Northern Irish section of the story and its most dramatic. The coast around Ballycastle, Fair Head, and Torr Head looks across this narrow, often violent strait. On a stormy day, it’s easy to imagine the suffering of the swan-children on these waters.

The Children of Lir story is one of the Three Sorrows of Storytelling in Irish tradition, alongside the stories of Deirdre and the Sons of Uisneach and the Children of Tuireann.

Deirdre of the Sorrows

Another of the Three Sorrows, and deeply connected to the landscape of County Antrim.

The Story

At Deirdre’s birth, the druid Cathbad prophesied that she would be the most beautiful woman in Ireland but would bring death and destruction. King Conor of Ulster (the same court at Emain Macha where Cú Chulainn served) raised her in isolation, intending to marry her himself. But Deirdre fell in love with Naoise, a young warrior, and they eloped to Scotland with his two brothers, the Sons of Uisneach.

Conor lured them back to Ireland with false promises of forgiveness. When they returned, he had Naoise and his brothers killed. Deirdre, grief-stricken, killed herself rather than live with Conor.

Northern Ireland Connections

The story is set partly in the Glens of Antrim, where Deirdre and Naoise lived before fleeing to Scotland. Several places in the Glens claim connections:

The Vanishing Lake (Loughareema) on the road between Ballycastle and Cushendall — a lake that periodically drains through underground fissures and refills, said to be connected to Deirdre’s tears.
Various sites in Glenariff and Cushendun — Cushendun’s caves are sometimes associated with the lovers’ departure point for Scotland.

The Fairy Folk

Beyond the grand mythological cycles, Northern Ireland has a rich tradition of fairy lore that persisted well into the 20th century — and, in some rural areas, hasn’t entirely disappeared.

The Sidhe

The fairy folk in Irish tradition are not the tiny winged creatures of English fairy tales. The Aes Sídhe (people of the mounds) are the Tuatha Dé Danann — the old gods — who retreated into the hollow hills when humans arrived. They are powerful, beautiful, dangerous, and amoral. They live in fairy forts (ring forts — circular earthworks found across the Irish countryside, most of which are actually the remains of early medieval farmsteads).

The taboo against disturbing fairy forts remains strong in rural Ireland, including Northern Ireland. Farmers who would cheerfully bulldoze anything else will leave a fairy fort untouched. Roads have been rerouted to avoid them. In 1999, a planned road in County Clare was altered because of local resistance to disturbing a fairy bush. This isn’t quaint superstition recycled for tourists — these beliefs genuinely persist.

The Banshee

The banshee (bean sí — woman of the fairy mound) is the most feared figure in Irish fairy lore. She is a spirit associated with certain families, and her wailing — the keening — is heard before a death. Different traditions describe her differently: sometimes a beautiful young woman, sometimes an old hag, sometimes a washerwoman cleaning bloodstained clothes at a ford. Her cry is unmistakable and unforgettable.

Banshee traditions are found across Ulster. Many Northern Irish families have stories of the banshee being heard before a death — stories told seriously, not as entertainment.

Where Myth Meets Landscape

What makes Northern Ireland’s mythology compelling for visitors is how inextricable it is from the landscape. You can’t visit the Giant’s Causeway without hearing about Finn McCool. You can’t drive the Causeway Coastal Route without passing through landscapes that are, in the oldest stories, the territories of gods, heroes, and fairy folk.

This isn’t coincidence. The myths grew from the landscape. People looked at the Causeway’s hexagonal columns and needed a story to explain them. They looked at the Sea of Moyle’s violence and imagined swan-children suffering. They saw ring forts on hilltops and populated them with beings who were there before humans.

The landscape came first. The stories followed. And now, thousands of years later, the stories are so deeply embedded in the landscape that separating the two feels impossible — and unnecessary. The geological explanation and the mythological one can coexist. The Causeway was formed by volcanic activity 60 million years ago. Finn McCool also built it. Both are true in the ways that matter.