Crom Cruach
The Cenél Enda (Énna or Eanna) located in the southern Co. Donegal and northern Fermanagh region. An area known as Magh Ene was located at the southern tip of co. Donegal, perhaps alluding to the area described in the Book of Fenagh. The latter area was later dominated by septs of the Cenél Conaill (Conal Gulban, son of Niall of the Nine Hostages) through the fourteenth century. For much of Uladh's history as Donegal or Tirconaill, the Dal nAriade and the Dal Fiatach were the ruling dynasties. From the ancient capital of Armagh, Eamhain Macha in Ulidia-Oriel was restricted to the territory east of the river Bann, Lough Neagh, and the Newry river. The Ciarraighe Locha na nAirne were originally part of a greater kingdom, the Ciannacht tribal kingdom of Ciarraighe (Kerry), centered at Cruachu (the ancient capital of Connacht).
In the Ulster Cycle, Cruachu is the center of the Gaelic-Laiginian alliance. Branches in Donegal and Clare became more important. The pre-Milesian race: Corca Luighe and the name Luighe was common among their early chiefs. These races and the Red Branch of Ulster or Craobh Ruadh [Creeveroe] had been gradually pushed south of the Bandon river between the Derrynasaggart Mountains and the Cork Harbour by the Eoghanachta and the Oirghialla, which anciently extended from this Glenree to Lough Erne, and comprised Clogher (the counties of Louth, Armagh, Monaghan), and in later ages the whole of the County of Fermanagh. Magh Line is described the Circuit of Ireland, by Muirchertach in the barony and county of Antrim, south of Dalriada, from Lough Negh to near Carrickfergus.
Leitrim, together with that of Cavan and part of Fermanagh (Clann Fermaighe and the Airghiallan federation) afterwards formed the territory of Breffny which was divided into two principalities, of which the present county of Leitrim formed the western, under the name of Lower or West Breffny, and Hy Briuin Breffny, from Brian, son of Eachod, and grandson of (Meriadoc) Muredach, first king of Connaught of the Scottish race. The Ui Fiachrach Finn - descended from Fiachra Finn, grandson of Maine Mór (a quo Uí Maine), this tribal name (Clan Nechtan) was noted in Moenmoy, county Roscommon. O'Hart described a district of Meath or Orior in northwest county Westmeath (& SE co. Longford) as a district near the borders of Co. Longford at the east of the Shannon River and Leitrim: the ancestry to that of the Conmaicne of clan Rudhraigh, descendants of Cairbre, called the 'Ui Cairbri, and later the Muintir Anghaile, a tribe of the Conmaicne Rein near the border of modern counties Leitrim and Longford. This kingdom of the Masraighe tribe was fragmented by the Uí Briuin of the North Gaels during the late eighth century or early ninth century.
Loctaed in northwest County Cavan, the name of an ancient tribe Masraige and the Cenél Enda inhabiting the area about Magh Slecht, and attributed by some as Fir Bolg in origin. The Masraighe were also called the Sons of the Liath or the Tuatha Slécht and Magh Slécht was sometimes called Liathmhuine. The descendants of the Uí Briuin are now called the McGovern clan and are still the most numerous surname in the area.
Crom is mentioned in the Dinnshenchas (meaning Lore of Places) in the Book of Leinster, as well as the Tripartite Life of Patrick and the 14th century Book of McGovern. He may be the same as the Clogher idol Cermand Cestach.