The Invasions of Ireland
Celtic creation mythology, particularly in Ireland, is unique in that it focuses not on the creation of the universe itself, but on the successive waves of peoples who came to inhabit Ireland, transforming it from formless void to sacred land. This is the story of the Lebor Gabála Érenn (Book of Invasions) - how Ireland came to be through conquest and settlement, how the gods became gods, and how mortals inherited the land.
Primordial State: Before the First Coming
Before the first invasion, Ireland existed in a state of formless potential - not void exactly, but unmarked and unclaimed. The land was there, but unnamed, unshaped, uninhabited. There was no distinction yet between mortal realm and Otherworld, no structure, no order.
Unlike creation myths that begin with cosmic nothingness or primordial chaos, Celtic tradition begins with the land already present but sleeping, waiting for beings to claim it, name it, and bring it into being through inhabitation. Creation happens through arrival and settlement, not through divine command or cosmic sacrifice (though there are elements of both in later invasions).
The waters surrounded the land - the great ocean from which successive peoples would emerge. The Otherworld existed alongside, interpenetrating with the physical realm, but undifferentiated. Time had not yet begun its cycle.
The Five Invasions of Ireland
According to the Lebor Gabála Érenn, Ireland was invaded by six groups (though traditions vary). Each invasion shaped the land further, until finally mortals inherited it from the gods:
1Cessair and the First People
Who: Cessair, granddaughter of Noah (in Christianized version), and her followers - 50 women and 3 men.
When: Before the Biblical Flood
Fate: All perished in the Flood except Fintan mac Bóchra, who survived through transformation (became a salmon, then an eagle, then a hawk), witnessing all subsequent invasions. Fintan represents the eternal witness, the memory of the land itself.
Significance: The first attempt to claim Ireland, demonstrating that the land cannot be taken without cost. The land chooses who may dwell upon it.
2Partholón and His People
Who: Partholón, a leader with his followers, came from the western sea.
Achievement: First to clear plains for agriculture, create lakes, wage war (against the Fomorians - primordial forces of chaos and darkness), establish basic civilization. Divided Ireland into four parts.
Fate: After 300 years, all 5,000 of Partholón's people died in a plague in a single week. Buried at Tallaght.
Significance: Demonstrated that Ireland could be inhabited and cultivated, but the land demands respect - overreach brings destruction.
3Nemed and His People
Who: Nemed, arriving 30 years after Partholón's plague.
Achievement: Cleared more plains, built royal forts, continued the work of civilization. Fought the Fomorians (forces of chaos dwelling in Ireland).
Fate: Most died of plague. The survivors were enslaved by the Fomorians, forced to pay tribute of two-thirds of their children and crops each Samhain. They finally rebelled but were defeated. Only 30 survivors escaped - some to the "northern islands of the world" (where they would learn magic and return as the Tuatha Dé Danann), some to other lands.
Significance: Introduced the eternal conflict between order (civilization) and chaos (Fomorians). Those who escaped would return as gods.
4The Fir Bolg
Who: "Men of Bags" - descendants of Nemed's people who had been enslaved in Greece and escaped.
Achievement: Divided Ireland into five provinces (still recognizable today): Ulster, Leinster, Munster, Connacht, and Meath. Established kingship properly for the first time. Ruled justly and fairly.
Fate: Defeated by the Tuatha Dé Danann at the First Battle of Magh Tuireadh but allowed to keep Connacht. Became mortal people, ancestors of some Irish clans.
Significance: First successful long-term inhabitants. Established sovereignty and just rule, but lacked the magical power to hold the land against divine beings.
5The Tuatha Dé Danann - The Gods
Who: The "People of the Goddess Danu" - descendants of Nemed's people who had fled to the "northern islands" (Otherworld realms) where they learned druidry, magic, and all arts.
Arrival: Came to Ireland in dark clouds (or burned their ships to prevent retreat, creating the clouds). Brought the Four Treasures from their four cities: the Stone of Fál from Falias, the Spear of Lugh from Gorias, the Sword of Nuada from Findias, and the Cauldron of the Dagda from Murias.
Achievement: Defeated the Fir Bolg at the First Battle of Magh Tuireadh. Defeated the Fomorians (chaos forces) at the Second Battle of Magh Tuireadh, establishing divine order over chaos. Ruled Ireland in a golden age of magic, abundance, and art.
Fate: Eventually defeated by the Milesians (mortal humans) through druidic magic and agreements. Rather than leave Ireland, they retreated into the Otherworld, dwelling in the sidhe mounds beneath the hollow hills, becoming the gods who influence the mortal realm from within.
Significance: The Tuatha Dé Danann are THE gods of Irish mythology. Their time represents the perfection of divine order on earth. Their retreat into the Otherworld establishes the parallel realms of gods and mortals.
6The Milesians - Mortal Humans
Who: The Sons of Míl Espáine (Soldier of Spain), ancestors of the Gaelic Irish. Mortal humans coming from Iberia.
Arrival: Sailed from Spain (or from the western Otherworld - sources vary). When they landed, the three goddesses of Ireland - Ériu, Banba, and Fódla - each asked that the island be named after her. Ériu's request was granted (giving Ireland its name: Éire, Erin).
Victory: Through a combination of warfare and druidic power, defeated the Tuatha Dé Danann. The poet Amergin spoke powerful verses at the moment of landing that gave them claim to the land.
Settlement: The Tuatha Dé Danann agreed to divide Ireland. The Milesians took the land above ground; the Tuatha Dé Danann took the land below ground (the sidhe mounds and Otherworld). This division established the relationship between mortal and divine realms that continues to the present day.
Significance: This is the point where mythology becomes "history" in Irish tradition - the Milesians are considered the ancestors of the Gaelic Irish people. The gods did not die or disappear but continue to exist in the Otherworld, accessible at thin places and times.
The Fomorians: Forces of Chaos
Running parallel to the invasions is the constant presence of the Fomorians (Fomoire) - primordial beings representing chaos, destruction, darkness, and the wild forces of nature. They are not simply "evil" but represent the untamed aspects of existence that resist order and civilization.
Nature: Often depicted as misshapen, having one eye, one arm, one leg, or other distortions. Associated with the sea, storms, disease, and blight. They dwelt on islands off the coast or in undersea fortresses.
Relationship to the Gods: Paradoxically, the Fomorians intermarried with the divine races. Lugh's mother was Ethniu, daughter of Balor the Fomorian. Bres, who became king of the Tuatha Dé Danann, was half-Fomorian. This suggests the Fomorians represent necessary aspects of reality - chaos that must be integrated, not merely destroyed.
The Second Battle of Magh Tuireadh: The decisive confrontation between order (Tuatha Dé Danann) and chaos (Fomorians). Lugh's slaying of his grandfather Balor symbolizes the younger generation overcoming the destructive aspects of the past while integrating its power. After this battle, the Fomorians cease to be a major threat, suggesting that chaos has been bounded (though never eliminated).
The Act of Creation: Naming and Claiming
Unlike many creation myths that feature divine command ("Let there be light") or cosmic sacrifice (Ymir, Purusha), Celtic creation happens through:
1. Arrival and Settlement
Each invasion brings Ireland more fully into being. The land exists, but it achieves its true form through inhabitation. To arrive, to clear plains, to name features - these acts create reality.
2. Naming and Poetry
When Amergin the poet first set foot in Ireland, he spoke verses claiming the land through naming. In Celtic thought, to name something is to bring it into being, to establish relationship with it. The triple goddesses Ériu, Banba, and Fódla ARE Ireland personified - the land is divine.
"I am the wind on the sea,
I am the wave of the ocean,
I am the murmur of the billows,
I am the bull of seven battles,
I am the eagle on the rock..."
By declaring "I am" these things, Amergin claims kinship with the land itself, establishing the right of humans to dwell there.
3. Division and Ordering
Partholón divided Ireland for the first time. The Fir Bolg divided it into five provinces. The Dagda divided the sidhe mounds among the gods. Each division brings order from undifferentiated wholeness.
4. Conflict and Victory
Creation happens through struggle. Each people must fight for their place - against previous inhabitants, against the Fomorians, against the land itself. Order emerges from overcoming chaos.
Current State: The World We Inhabit
The world we live in now is the result of these successive invasions:
- Mortal Realm Above: Humans (descendants of the Milesians) dwell on the surface of the land, tending it, ruling it, living mortal lives subject to time, decay, and death.
- Divine Realm Below/Beyond: The Tuatha Dé Danann dwell in the Otherworld - beneath the sidhe mounds, on western islands, in a parallel dimension accessible at thin places. They have not died but transformed, becoming the gods who interact with mortals.
- Chaos Bounded: The Fomorians have been defeated but not destroyed - they remain at the edges, in the deep sea, in storms and disasters, representing the ever-present potential for chaos to return.
- Sacred Land: Ireland itself is sacred, a goddess in physical form. The land's health depends on the virtue of its rulers (sovereignty magic). When the king is just, the land flourishes; when the king is false, the land withers.
- Interpenetration: The mortal and divine realms touch constantly. At Samhain, at sacred wells, in oak groves, at stone circles - the boundaries thin, allowing passage and interaction.
Primary Sources
- Lebor Gabála Érenn (Book of Invasions) - Primary source for the invasion cycles
- Cath Maige Tuired (The Second Battle of Magh Tuireadh) - The defeat of the Fomorians
- The Book of Leinster - Contains versions of the invasion myths
- Various medieval Irish manuscripts - Preserving pre-Christian oral traditions
Archetypal Connections
The Divine Invasion
Creation through successive waves of settlement - the land awakening through inhabitation.
Explore the Creation ArchetypeOrder vs Chaos
The eternal struggle between the Tuatha De Danann and the Fomorians.
Explore Order vs ChaosThe Sacred Land
Ireland as goddess - Eriu, Banba, Fodla - the land itself as divine being.
Explore the Sacred Land