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Achaidh Leithdeircc

Belligerents The Ulaid The Three CollasCommanders and leaders King Fearghus Fogha Colla Meann, Colla Uais, Colla Da Crioch Battle site disputed between: Aghaderg parish - Barony of Dartree - Barony of Farney.Achaidh Leithdeircc (modern spelling Achadh Leith-dheirg) is an ancient location in Ireland reputed to be the site of a historic battle, or series of battles, around the year 331 AD, in which the forces of the Three Collas along with men of Connaught eventually conquered vast tracts of territory from the tribes of the Ulaid.

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