Mícheál Ó Cléirigh, sometimes known as Michael O'Clery, was an Irish chronicler, scribe and antiquary and chief author of the Annals of the Four Masters, assisted by Cú Choigcríche Ó Cléirigh, Fearfeasa Ó Maol Chonaire, and Peregrinus Ó Duibhgeannain. He was a member of the O'Cleric Bardic family and compiled with others the Annála Ríoghachta Éireann at Bundrowse in County Leitrim on 10 August 1636. He also wrote the Martyrology of Donegal in the 17th century.
Signature page from the Annals of the Four Masters. Ó Cléirigh's signature is first in the list
Annals of the Four Masters
The Annals of the Kingdom of Ireland or the Annals of the Four Masters are chronicles of medieval Irish history. The entries span from the Deluge, dated as 2,242 years after creation to AD 1616.
Entry for AD 432
Signature page from the Annals of the Four Masters
Monument to the Four Masters, located at the bridge over the Drowes River near Kinlough, near the homeland of Cú Choigríche Ó Duibhgeannáin
Illustration of "the four masters" by B. H. Holbrooke, 1846