In the second century, at the time that Conn of the Hundred Battles was Ard-Ri of Ireland, Mogh Nuadat, an Eberian, roused his fellow Munstermen to battle for freedom from the tyrannical Earnaan. Conn was jealous of the Munstermen and sympathetic towards his fellow Northerners, the Earnaan, and lent them his support. Despite this the Earnaan were overthrown and Mogh Nuadat was made King of the province.
Mogh, over-confident after his victory over the Earnaan, then went after Conn himself but he was defeated and had to flee the country. He took refuge in Spain and remained there for nine years marrying Beara, the daughter of Heber Mor, King of Castile.