As a young man, he participated in the compilation of the Annals of the Four Masters, working with Mícheál Ó Cléirigh, Cú Choigcríche Ó Cléirigh, Peregrine Ó Duibhgeannain and other assistants.
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He participated in the compilation of the years up to 1333 with Ó Duibhgeannáin, the Ó Cléirigh's writing the rest of the book to 1616.
Mícheál Ó Cléirigh | Ó Cléirigh | Cú Choigcríche Ó Cléirigh | Lughaidh Ó Cléirigh |
In collaboration with Micheál Ó Cléirigh and his team of scholars in Ireland, the entire effort was supervised by Father Hugh Ward (Aedh Mac an Bháird), rector and guardian of the great Irish College of St. Anthony in Louvain, the Spanish Netherlands (modern Belgium), and the most important Irish publishing center in Europe for nearly fifty years.