The barony's boundaries, however, coincide with those of an ancient territory known as Tuath Ratha (people/tribe of the fort), the principal family of which was the O'Flanagans (), the ruling family of the Cenél Cairbre Tuath Ratha. The O'Flanagans were an important medieval family based at Ballyflanagan (present day townland of Aghamore) in Magheraboy, and they once controlled the entire western side of Lower Lough Erne from Belleek to Belmore Mountain.