A future claimed by a king
A cry from an unborn child interrupts a feast. The druid Cathbad predicts that the girl, Deirdre, will be exceptionally beautiful and will bring calamity to Ulster. Some demand her death; Conchobar instead orders that she be reared apart until she can become his wife. Her life is organized around a royal claim before she can express any preference.
When she grows up, the sight of a raven beside blood on snow supplies her description of the man she would love. Leabharcham identifies Naoise as such a man. Deirdre seeks him out and presses him to take her away, overcoming his fear of Cathbad's warning. His brothers join their flight with a substantial following.
Source: The Exile of the Sons of Usnach: Book of Leinster version — Leahy translation · Book of Leinster version: prenatal cry, Cathbad’s prophecy, secluded upbringing, raven scene and departure
Exile does not remove the threat
The fugitives move through Ireland before crossing to Alba. There they survive by hunting, raiding, and eventually entering a king's service. Once that ruler learns of Deirdre's beauty, he also seeks to remove her husband. She reports the secret approaches to Naoise, and the group escapes another planned attack.
Ulster finally offers a return under named guarantors, including Fergus. Conchobar contrives to keep Fergus at a feast while the brothers proceed toward Emain under the protection of his son Fiacha. Eogan attacks Naoise, and Fiacha attempts to shelter him with his own body. Both die; the remaining company is slaughtered and Deirdre is taken bound into the king's power.
Source: The Exile of the Sons of Usnach: Book of Leinster version — Leahy translation · Book of Leinster version: Alba service and threatened betrayal; invitation, sureties, feast diversion and killing at Emain
The cost of an unenforced promise
Fergus and the other guarantors retaliate, burn Emain, and go into exile with a large following. They join Ailill and Medb in Connacht and continue attacking Ulster. The betrayal therefore damages the king's own political and military community, rather than merely ending a private love affair.
Deirdre spends a year refusing consolation. Her laments contrast royal luxury with the chosen companionship of the exiles. When Conchobar sends her to Eogan, the man who killed Naoise, and mocks her position between them, she ends her life against a rock. This is the Book of Leinster ending printed by Leahy; his separate later lament and conclusion should not be silently substituted for it. Prophecy frames the catastrophe, but the narrative also makes deliberate coercion and treachery visible at every decisive point.
Source: The Exile of the Sons of Usnach: Book of Leinster version — Leahy translation · Book of Leinster version: guarantors’ revenge and exile; Deirdre’s laments, transfer to Eogan and death
- Period / witness
- Medieval Irish prose and verse preserved in medieval and early modern manuscript witnesses; Leahy translation 1905–1906.
- Recording context
- This entry concerns the literary version named in its passages, transmitted by Christian-era Irish manuscript culture and translated by A. H. Leahy. Legendary settings are not dates of composition or evidence for a single pre-Christian canon.
A recording location is not necessarily a story’s origin. Dates of texts, copies, and translations answer different questions.
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The Exile of the Sons of Usnach: Book of Leinster version — Leahy translation ↗
Anonymous Irish literary narratives; translated and arranged by Arthur Herbert Leahy (1857–1928) · Volume I, 1905; Project Gutenberg eBook released May 2004 and updated 29 June 2026
Edition & rights note