In Irish Mythology Díthorba or Diothorba was a High King of Ireland. He ruled in rotation with his cousins Áed Ruad and Cimbáeth, each ruling for seven years in turn. Each ruled for three seven-year periods.
Áed had died at the end of his third stint in the kingship, and when Cimbáeth completed his third seven-year period, Áed's daughter Macha demanded the kingship in her father's place. Díthorba and Cimbáeth refused, but Macha defeated them on the battlefield. Díthorba was killed in Connacht, and his sons were forced to build Emain Macha.
Macha went on to marry Cimbáeth, and they ruled for another seven years until Cimbáeth died, and Macha became the only queen in her own right in the List of High Kings of Ireland.
