Gougaud. L. Gougaud, Les Chrétientés Celtiques, 1911.
Gwynn. The Book of Armagh, ed. J. Gwynn, 1913.
J.R.S.A.I. Journal of the Royal Society of Antiquaries of Ireland: references to volumes according to the consecutive numbering.
Jaffé. Regesta Pontificum Romanorum, ed. P. Jaffé, 1851.
John of Hexham. Historia Johannis Prioris Hagustaldensis Ecclesiae, in Symeonis Monachi Dunelmensis Opera Omnia, ed. T. Arnold (R.S.), ii. (1885), 284 ff.
K. Codex Kilkenniensis; Marsh's Library, Dublin, MS. Z. 1.5, containing the Vita S. Malachiae. Cent. xv.
Keating. G. Keating, History of Ireland, ed. D. Comyn and P. S. Dinneen (Irish Texts Society), 1902-1914.
L.A.J. County Louth Archæological Journal.
L.B. Leabhar Breac, Royal Irish Academy MS. (Facsimile ed. 1876.)
Lanigan. J. Lanigan, An Ecclesiastical History of Ireland ... to the Beginning of the Thirteenth Century, 1829.