 Around the 6th century a people known as the Conmaicne Rein are thought to have moved north from around the present Dunmore in County Galway and settled in Magh Rein (the area around Fenagh).From here they peopled what is now South Leitrim, which became known as Magh Rein, and its inhabitants as the Conmaicne Magh Rein.They consisted of different family groupings – Muintir Eolais, Muintir Cearbhallain (O Mulvey), and Cinel Luachain, among others.