THE following were the Chiefs and Clans of Fermanagh, and the territories they possessed in the twelfth century;

MacCassidy

hereditary physicians to the Maguires. Roderick MacCassidy, archdeacon of Clogher, who partly compiled the "Annals of Ulster," was a distinguished member of this important family.

O'Criochain

(who were descended from Colla-da-Chrioch), anglicised O'Creighan, O'Greighan, Cregan, Crehan, Creighton, Creehan, Grehan, and Graham, were a numerous clan in Fermanagh.

MacDonnell

Chief of Clan Celleagh, now the Barony of "Clankelly."

MacDuilgen or MacDwilgan

not mentioned in O'Dugan, is A.D. 924, in the Annals of the Four Masters, given as Fergus MacDuilgen, Lord of Lurg

O'Flanagan

Chief of Tuath Ratha (a name retained by the mountain "Tura") or the District of the Fortress, a territory which extended from Belmore to Belleek, and from Lough Melvin to Lough Erne, comprising the present Barony of Magheraboy.

Chief of Muintir Peodachain of the Port, on the borders of Fermanagh and Donegal; and still traceable in the name of "Pettigo". ("Pakenham" from this Irish clan: Peodachain, Pachain, Pachena, Pakenha -- Pakenham)

Mac Giolla Michil or Gilmichael

(Anglicized "Michil" and "Michael") was Chief of Clan Congail. In the Annals of the Four Masters, at A.D. 1238, it is stated that Clan Congail and O'Ceanfada [O'Kennedy] lay in Tir Managh or Fermanagh: this Clan or Tir O'Ceanfhada is probably the present Barony of "Tirkennedy."

MacGrath

who held possession at Termon M'Grath, where they had a castle in the parish of Templecarne. "Maguire's Country" was, in the reign of Queen Elizabeth, A.D. 1569, formed into the county Fermanagh, by the Lord deputy Sir Henry Sidney.

MacManus

a numerous clan (Chiefly in Tirkennedy), who had the control of the shipping on Lough Erne, and held the office of hereditary Chief managers of the fisheries under Maguire.

O'Muldoon

Chief of Muintir Maolduin and Feara Luirg, now known as the Barony of "Lurg."

Muintir Taithligh,Tilly or Tully

Chiefs of Hy-Laoghaire, of Lough Lir, a district which lay in the Barony of Lurg, near Lough Erne, towards Tyrone.

O'Mulrooney and O'Heany

who were Chiefs of Muintir Maolruanaidh (as the descendants of Maolruanaidh, and of Maoith Leirg Monach.

MacUidhir

(Anglicized MacGuire and Maguire) was Chief of Feara Monach (or "Fermanagh").  As tradition has it the ancient Manaigh or Monaigh occupied the area near Lough Erne, giving their name to the modern county of Fermanagh. They spread northwards as the Fir Manach, or Monaig in Irish. Early Irish genealogists claim they migrated from south Leinster.