Following the decisive Battle of Clontarf in 1014, which shattered Viking power in Ireland and resulted in the death of High King Brian Boru, Irish monastic scriptoriums and secular bardic families undergo an intense period of cultural preservation. Fearing the loss of ancient lore amidst decades of regional warfare, scholars begin systematically collecting, revising, and recording oral mythological tales and historic genealogies into Old and Middle Irish manuscripts. This movement aimed to forge a cohesive national narrative of Gaelic identity, heavily drawing upon the pre-Christian oral traditions of the 'filid' (elite class of poets).

This period of systematic recording preserved the core of the Ulster and Fenian cycles, formatting ancient oral prose-and-verse narratives into surviving written texts. It re-established the elite political status of the poet in Irish society, ensuring that the elaborate bardic schools and strict rules of metric composition ('dán díreach') survived intact through the medieval period.