Muinemón (later spelling
Muineamhón), son of Cas Clothach, son of Irárd, son of Rothechtaid, son of Ros, son of Glas, son of Nuadu Declam, son of
Eochaid Faebar Glas, was, according to medieval Irish legend and historical tradition, a
High King of Ireland. He helped
Fíachu Fínscothach to murder his father,
Sétna Airt, and become High King, and then, twenty years later, killed Fíachu and became High King himself. He is said to have been the first king in Ireland whose followers wore golden
torcs around their necks (his name may derive from
Old Irish muin, neck). He ruled for five years, until he died of plague at Aidne in
Connacht, and was succeeded by his son
Faildergdóit. The chronology of
Geoffrey Keating's
Foras Feasa ar Éirinn dates his reign to 955–950 BC, that of the
Annals of the Four Masters to 1333–1328 BC.