Táin Bó Cúailnge — “The Cattle Raid of Cooley”
Original Author: Anonymous
Credit: Original Credit:
Book of Leinster (12th century) — primary complete source
Lebor na hUidre (c. 1100) — earlier partial source
Royal Irish Academy / Trinity College Dublin — custodians of manuscripts
Original Date Written:
Oral origins: pre‑Christian Iron Age
Earliest written fragments: 8th–9th century
First complete surviving version: c. 1160 (Book of Leinster)

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Táin Bó Cúailnge — “The Cattle Raid of Cooley” — is the central epic of Ireland’s Ulster Cycle and the great heroic saga of Cú Chulainn. Rooted in pre‑Christian oral tradition, the story was first written down in Old Irish and survives most fully in the 12th‑century Book of Leinster, with earlier fragments in Lebor na hUidre.
The epic recounts Queen Medb’s invasion of Ulster to seize the prized Brown Bull of Cooley, opposed single‑handedly by the young warrior Cú Chulainn. The tale blends myth, battle poetry, supernatural encounters, geasa (taboos), and tragic prophecy, forming one of the oldest heroic narratives in Western Europe.
Its medieval manuscript tradition makes The Táin both a literary treasure and a cultural cornerstone of Irish identity.

