From: Keating's, History of Ireland, vol 3, page 727 The following chiefs and clans of Fermanagh, and the territories they possessed in the 12th century, have been collected from O'Dugan's Topography. 1. O'Maolduin, or O'Muldoon, chief of Muintir Maelduin and Fera Luirg, Now known as Lurg. 2. Muintir Taithligh, or Mac Tullys, chiefs of UI Laoghaire, Lough Lir, a district which lay in the barony of Lurg, near Lough Erne, towards Tyrone. 3. Mac Duilgen ( no information ) 4. O'Flannagain, or O'Flanagan, chief of Tuath Ratha, a territory which extended from Belmore to Belleek, and from Lough Melvin to Lough Erne, comprising the present Barony of Magheraboy. It containerd the ancient districts of farther Maighe and Magh Niadh, and it's name is still retained by the mountain Tura. 5. Mac Gilla-Finein, or Mac GIllfinnen, chief of Muintir Peodachain of the Port. This territory, on the borders of Fermanagh and Donegal is still traceable in the name of Pettigo; and he was styled, Lord of Lough Erne. 6. MacGilla-Michil, chief of clann Congail and O'Ceanfoda. Clan Congail lay in Tir Manach, Tirkennedy barony is probably Tir O'Ceanghoda. The name Mac Gilla-MIchil, has been anglicised to Mitchell. 7. O'Maolruana, or Mulrooney, and O'Eignigh, or O'Heignigh, probably O'Heaney, who were chiefs of Muinti Maolruanaiddh, and of Moith Leirg Monach. 8. Mac Domhnaill, or Mac Donnell, chief of Clan Cealklaigh, now the barony of Clankelly. 9. The Mac Manuses, formerly 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. 10. The Mac Cassidys, who were hereditary Physicians to the Maguires, and many of the name also learned ecclesiastics and historians, amongst whom may be mentioned Roderick Mac Cssidy, archdeacon of Clogher, who partly compiled the "Annuals of Ulster" 11. The O'Cricochand, or O'Creehans, a numerous clan in Fermanagh, many of whom have changed their name to Creighton. 12. The Magraths, who had some possessions at Termon Magrath, where they had a castle in the parish of Templecarn.