It was culled by the compilers from various sources, some of which can be identified as distinct, regionally focused groups in the text.
One such group is that of the O'Donohue Lives, so-called after one of the manuscript's contributors, Diarmaid Ó Dúnchadha.
These works are mostly eighth- and ninth-century Lives of saints whose monasteries lay in central Ireland (around Slieve Bloom), in parts of Munster, Mide and Leinster.
They include saints like Ciarán of Saighir, Ailbe of Emly, Ruadán of Lorrha and Cainnech of Aghaboe.
[1] The collection also includes five short Lives of saints associated with northern churches (in Ulster or the Airgíalla): Mo Lua of Drumsnat, Daig of Inniskeen, Mochta of Louth, Éogan of Ardstraw and Mac Nisse of Connor.