Mithin [Meehan], of Bealach ui Mithin, died." "1398: David O Duigeannain, Coarb of the Virgin St. Lasair, chief chronicler of MacDiarmuda [MacDermott] and his great favourite, a hospitaller for all comers of Eirinn in general, a reverend attendant of a nobleman, and one that never refused anyone for anything he had until his death, died in his house and was interred in the Church of Cill Ronan." By 1400 a secondary line had established themselves in Muintir Eolais, at Baile Caille Foghair, or Castlefore, now in County Leitrim. Their ancestor was Philip na hInishe who died in Conmaicne in 1340, said to be a brother of Fearghall Muimhneach. The first member of the family mentioned as of Castlefore was Maghnus mac Melaghlin Ruadh O Duibggeannain, who died in 1452. He is apparently the same Maghnus of Castlefore was the chief compiler of the Book of Ballymote, which was commissioned by Tomaltach MacDonagh, Lord of Coran, about or after 1391. Irish historical manuscripts compiled and penned by various O Duibhgeannain which have survived their turbulent times include: Annala Loch Ce (The Annals of Loch Ce) Leabhair O Duibhgeannain Cill Ronan – source book used for the Four Masters. The Annals of the Kingdom of Ireland (better known as the Annals of the Four Masters) Suibhne Gelt (The Frenzy of Sweeney) Peregrine and Daibhidh The two most significant Ó Duibhgeannáins during the final years of Gaelic Ireland were Cu Coigriche mac Tuathal O Duibhgeannain of Castlefore (fl. 1627–1636), and Daibhidh mac Matthew Glas O Duibhgeann of Kilronan (fl. 1651–1696). Cu Coigriche, thought to have been born about or after 1590, was ordained a Franciscan friar and changed his name to Peregrine O'Duignan. Nothing is known of his life until he became engaged in the massive project known to history as the Annals of the Kingdom of Ireland (better known by its nickname, the Annals of the Four Masters). The annals are known by this name because, under the leadership of Bro. Michael O'Clery (Michael Ó Cleirigh), Peregrine, Cu Choigriche (Peregrine) Ó Cleirigh, and Fearfeasa Ó Maoilchonaire, these four men compiled and wrote in a few years (c. 1627–1636) one of the largest collections of mythical, historical and cultural lore – spanning the years 2242 AM to 1616 AD. Nothing certain is known of Peregrine after August 1636; possibly he returned to Louvain, as did Ó Cleirigh. However, there exists a slight possibility