sentences:  The narrative is presented in the first person, as if Patrick himself were the narrator.To research his subject, Tírechán read and interviewed Ultan, and studied the “Confessio” of St. Patrick, the work “Commemoratio Laborum,” and narratives in the oral tradition passed down from “seniors” and “wise ancients.” He seems to have been motivated not only by his esteem for the saint, but also by indignation at the attacks on Patrick’s successors and representatives, the coarbs, perpetrated by “deserters and robber chiefs and soldiers” in Armagh.In addition, Tírechán has been credited as the author of the anonymous "Catalogus Sanctorum Hiberniae", which is considered a worthy source of information about early Christianity.