Conn Cétchathach (pronounced [kon͈ ˈkʲeːdxaθəx]), or Conn of the Hundred Battles, son of Fedlimid Rechtmar, was a legendary High King of Ireland who is claimed to be the ancestor of the Connachta, and through his descendant Niall Noígiallach, the Uí Néill dynasties, which dominated Ireland in the early Middle Ages.