The Cenél Enda (nEnda, nEnnae, Énna or Eanna) - southern Co. Donegal and northern Fermanagh. The Cenél n-Enda mic Neill were noted west of Loch Erne (Book of Lecan).

In the 5th century Enda, the youngest son of Niall of the Nine Hostages received territory which extended from the river Errity to Barnesmore, barony of Tir Hugh, to Sruell in the barony of Banagh, county of Donegal. The north-western limit was Farnagh in the parish of Aughnis, barony of Kilmacrenan. The eastern limit of his lands was the river Finn. From Eanna (Enda), son of Niall of the Nine Hostages, descended the Cenél Eanna, Kings of Magh Ith, Tir Eanna and Fanad in present day Co. Donegal until dispossessed of their territories by the expansion of the Cenél Chonaill septs in the 12th century. Magh Ithe was the first recorded battle in Ireland myths (2071 BC).

There was a Cenel Enda sept in the Lough Swilly-Foyle area, with thirty quarterlands south of Inishowen. Another related? sept settled near the hill of Uisneach, in Co. Westmeath. O'Flanagan (Ó Flannagáin), of the same line as O'Connor, is given as chiefs of Tuath Ratha (Toora) and of the barony of Magheraboy in Co. Fermanagh.

Throughout the 11th and 12th centuries the Kings of Fermanagh - O'hEignigh, O'Maolruanaidh and O'Dubhdara - were drawn from the Airghialla, its Clann Lugainn branch, which is stated in the early genealogies to go back to one of the three Collas, i.e. Colla Fochríth.

The O'Heany or Hegney (Ó hEignigh) and Mulrooney (Maolruanaidh) septs were noted as kings of Fermanagh (Fer Manach) until becoming tributary to the Maguires (Meicc h-Uidir. or Mag Uidhir) around 1202.

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