Between 1878 and 1881, Standish O’Grady published a three-volume History of Ireland that simultaneously recounted the heroic ancient past of the Irish people and helped to usher in a new era of cultural revival and political upheaval. At the heart of this history was the figure of Cuculain, the great mythic hero who would inspire a generation of writers and revolutionaries, from W. B. Yeats and Lady Augusta Gregory to Patrick Pearse. Despite the profound influence O’Grady’s writings had on literary and political culture in Ireland, they are not as well known as they should be, particularly in view of the increasingly global interest in Irish culture. This critical edition of the Cuculain legend offers a concise, abridged version of the central story in History of Ireland—the rise of the young warrior, his famous exploits in the Táin Bó Cualinge (The Cattle Raid of Cooley), and his heroic death. Castle and Bixby’s edition also includes a scholarly introduction, biography, timeline, glossary, editorial notes, and critical essays, demonstrating the significance of O’Grady’s writing for the continued reimagining of Ireland’s past, present, and future. Inviting a new generation of readers to encounter this work, the volume provides the tools necessary to appreciate both O’Grady’s enduring importance as a writer and Cuculain’s continuing resonance as a cultural icon.