The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 179
How the Saint appeared unto Colmanus while singing his Hymn.
A certain abbot, a disciple of Saint Patrick, named Colmanus, was accustomed frequently to repeat this hymn; and when he was asked of the disciples why he would not rather sing the appointed offices and psalms, inasmuch as once to sing this hymn ought to suffice him, he continually beheld the face of his beloved father, Patrick, nor could he ever be satisfied with the contemplation thereof. This, though happening long after the death of Saint Patrick, we have written and recorded among his acts; that we may show how this hymn was esteemed among the people of Hibernia, and how ready was he in the hour of necessity and tribulation to aid those who honored him, and who frequently celebrated his memory.