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The O'Dalaigh are one of many of the clans of Ireland that trace their heritage to a single common ancestor. The accepted O'Dalaigh ancestral records beginning at the earliest reliable historical period center on King Niall of the Nine Hostages (pictured here).
Niall (pronounced Nall) reigned as Ireland's high king from A.D. 379 to 405.
The O'Dalaigh ancestry of times more remote than the age of Niall is linked to the "House of Heremon" by Ireland's ancient bardic genealogists. Heremon, the seventh son of King Milesius of Spain, ruled in the 17th century B.C.
THE HOUSE OF HEREMON
(Irish tradition holds that Heremon lived in the seventeenth century before Christ and died in 1684 B.C.)
(1) NIALL NAOIGIALLAC
i.e. King Niall of the Nine Hostages who reigned as Ireland's 126th High Monarch from 379-405, A.D.
Eldest son of Niall of the Nine Hostages. Eogban flourished during the time of St. Patrick.
(3) MUIREDHACH III
Son of Eoghan. Muiredhach III had twelve sons of whom the sixth was Dalach.
(4) MUIREDHACH MOR
Eldest son of Muiredhach III and the 131st Monarch of Ireland. Reigned twenty four years and died about the year 527.
Eldest son of Muiredhach Mor and the 134th Monarch of Ireland. Died about the year 561.
(6) AODH NAIRIODUAC
Son of Donnall and the 143rd Monarch of Ireland. Slain in the year 607.
Son of Aodh. Maoilfitreac had two sons: 1. Maolduin; 2. Maoituile.
A Prince of Ulster and the eldest son of Maoilfitreac. Maoldhuin had two sons:
1. Fearghal, 156th Monarch of Ireland who was slain in battle in year 718.
Youngest son of Maolduin.
Son of Adaimh.
Son of Corc.
Son of Fachtna. Aquo O'Dalaigh.
Son of Dalach.
Son of Gilla-coimhdheadh.
Son of Tadhg. Tadhg means poet.
Son of Muireadhach.
(17) CUCONNACHT NA SCOILE
i.e. "Of the school" indicating that he was an outstanding scholar. Cuconnacht appears to have been the first O'Dalaigh ancestor to adopt the family name He died in the year 1139.
(18) TADHG O'DALAIGH
Son of Cuconnacht. He was known as the Prince Poet of Ireland.
(19) AENGHUS FIONNABHRACH O'DALAIGH
The common ancestor of all the O'Dalaighs extant.
From "History of the O'Daly's, The Story of the Ancient Irish Sept, The Race of Dalach of Corca Adaimh" by Edmund Emmett O'Daly (Chicago, 1932).
Irish Family History Foundation
O'Daly Marriage Stone at Killimordaly Castle