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Seán Mór Ó Dubhagáin (died 1372) was an Irish Gaelic poet.
Ó Dubhagáinn was among the first notable members of the bardic family Baile Uí Dhubhagáin (Ballyduggan), near Loughrea, County Galway. He was accorded the rank ollamh seanchai (professional historian) to the Uí Maine recorded Irish clan history up until the Norman invasion of Ireland.
Ó Dubhagáin's most important work is Triallam timcheall na Fodla , a compilation of verse, giving the names of the various tribes, dynasties and territories of the Irish, and the various chiefs before the coming of the Normans. He devotes 152 lines to Meath, 354 to Ulster, 328 to Connacht, and only 56 to Leinster, possibly unfinished at his death.
Triallam is notable, in that he writes as though the Norman invasion never occurred, and as if many of the families listed still occupied their original territories. This, however, may reflect his interest as an antiquarian preserving ancient lore.
His contemporary, Giolla na Naomh Ó hUidhrín (died 1420), completed it. In Cambrensis Eversus, John Lynch says that he could not find "any better source than this remarkable poem" concerning the chief Irish families before the coming of the English. Ó Dubhagáin was the author of several other extant poems, all more or less in the nature of a memoria technica, valuable chiefly for their facts about the kings of Ireland and of the provinces. They include:
At least three other poems by him are extant, amounting to several hundreds of verses.
He also composed several rules for determining moveable feasts.
He was the teacher of Adhamh Ó Cianáin, who composed Leabhar Adhamh Ó Cianáin, in or about the 1340s. Ó Cianáin stated that he wrote it by and for himself, and out of a book of his teacher.
Ó Dubhagáin made a pilgrimage to St. Columba’s tomb and lived the rest of his life at a monastery on Loughrea, although other sources state he died at the monastery of Boyle in County Roscommon.
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Dugan or Duggan is an Irish surname derived from Ó Dubhagáinn.
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Leabhar Adhamh Ó Cianáin or The Book of Adhamh Ó Cianáin, now G 2-3 NLI, is a book written in or about the 1340s by Adhamh Ó Cianáin by and for himself, and out of the book of his teacher, Seán Mór Ó Dubhagáin.
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Leabhar Ua Maine is an Irish genealogical compilation, created c. 1392–94.
Giolla na Naomh O hUidhrin, Irish historian and poet, died 1420.
Gillagori Ua Dubhacan was Abbot of Aran, Ireland.
Ó Dubhagáinn was the name of a bardic family from Baile Uí Dhubhagáin, in Uí Maine,. The family were not related to similarly named family of Dugan of Fermoy, County Cork.
Ó Cianáin was the name of a Gaelic-Irish Brehon family. They were originally erenaghs of the parish of Cleenish, Lough Erne, but who had served for several centuries as historians to Mag Uidir of Fear Manach.
Triallam timcheall na Fodla is medieval Irish topographical text.
Tuilleadh feasa ar Éirinn óigh is a medieval Gaelic-Irish topographical text, composed by Giolla na Naomh Ó hUidhrín.
Faolán Mac an Ghabhann na Scéal, died 1423, was an Irish writer and genealogist. He was one of the ten scribes of Leabhar Ua Maine, commissioned by Archbishop of Tuam, Muircertach Ó Ceallaigh. His poem, Adham ar n-athair uile is penned in the text by Ádhamh Cúisín. Nothing else seems to be known of him.
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Fearghal Mág Samhradháin, was chief of the McGovern Clan and Baron or Lord of Tullyhaw barony, County Cavan from 1359 until his death in 1393.