 The ascription to Secundinus, whether true or false, is commonplace in medieval sources, occurring as early as in the "Félire Óengusso", and notably appears in the Irish preface preserved in some manuscript copies of the "Hymn".This preface adds some biographical detail, including a legend about Sechnall's quarrel and reconciliation with Patrick leading up to the composition of the hymn.A hagiographical "Life" was written for the saint, but it comes down to us only in a 17th-century manuscript compilation donated by Irish Jesuit Henry FitzSimon to the Bollandists.