Conn, "the Hundred-Battler", King of Ireland, was son of King Felimid the Lawgiver. He ascended the throne around 123 A.D. His greatest enemy was the King of Munster, Eoghan-Mor (Eugene or Owen More), also known as Mogh-Nuadhat. They fought bitterly, and finally Conn was obliged to yield Mor half of Ireland. The country was divided into two halves, the line extending from Dublin to Galway. Conn's northern half was called Leth-Chuinn (Conn's Half), Mor's southern half Leth-Mogha (Mogh's Half). After Eoghan's defeat by Goll Mac Morni at the battle of Magh Lena, Conn again ruled the whole country.

Conn was slain in 157 A. D. by Tiobraide Tireach, king of Uladh, at Tuath Amrois, near Tara, while preparing to celebrate the feis (festival) of Tara. He was buried at Brugh na Boinne, under a stone cairn, mentioned in the "Dinnsenchus."

Conn of the Hundred Battles was the ancestor of the families of O'Neill, O'Donnell, O'Kelly, O'Malley, O'Flaherty, Maguire, etc. He was succeeded by King Conaire II.

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