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Leinster, is one of the provinces of Ireland, situated in the East of Ireland, the name Leinster derives from Laigin, the name of the major tribe that once inhabited this area, Ugaine Mor, (Hugony the Great) who supposedly built the hill fort of Dun Ailinne, near Kilcullen in County Kildare.
Hugony is a likely, but uncertain candidate as the first historical king of the Laigin, in the 7th century BCE. From 175 – 185 AD following a period of civil wars in Ireland, the legendary Cathair Mor re-founded the kingdom of the Laigin.
The legendary Finn Mac Cool, or Fionn Mac Cumhaill, reputedly built a stronghold at the Hill of Allen, on the edge of the Bog of Allen, in what was then Leinster.
Reference used : Ancient documents.