tradition. The opening of the text establishes the groundwork for an in-depth examination of the Irish mythological cycle, referencing key historical sources and categorizations of these narratives. The initial chapters introduce the major epic cycles, detailing their relevance to the lives of the Irish people during the early centuries of the medieval period. D'Arbois de Jubainville begins by discussing various catalogs of epic literature, the significance of the mythological cycle, and the connections between the Irish myths and those of other cultures, notably the Greeks. He emphasizes the unique character of these stories while also noting their similarities to other mythologies, setting the stage for a comprehensive analysis of the Irish mythological tradition. (This is an automatically generated summary.)