The Lebor Gabála Érenn synchronises his reign with that of the Roman Emperor Augustus (27 BC – AD 14), and after the birth of Christ, and makes him contemporary with legendary provincial kings Conchobar mac Nessa, Cairbre Nia Fer and Ailill mac Máta. The chronology of Geoffrey Keating's Foras Feasa ar Éireann dates his reign to 64–63 BC, and that of the Annals of the Four Masters to 111–110 BC. The Four Masters combine his reign with that of Ér, Orba, Ferón and Fergna centuries before, to make a whole year in their chronology.