Ailill (or Oilioll), son of Slánoll, was, according to medieval Irish legend and historical tradition, a

High King of Ireland High King of Ireland ( ga, Ardrí na hÉireann ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and later sometimes assigned ana ...

; scholars now believe these kings to be a pseudohistorical construct of the eighth century AD, a projection into the distant past of a political entity which did not become a reality until Maelseachlainn I. He took power after killing his cousin

Berngal Berngal, son of Géde Ollgothach, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor and cousin and his father's killer, Fíachu Findoilches. He made so much war ...

. He ruled for twelve, fifteen or sixteen years, according to various versions of the '' Lebor Gabála Érenn'' ( Geoffrey Keating and the Four Masters'' Annals of the Four Masters'
M4003-4019
/ref> agree on sixteen) before he was killed by

Sírna Sáeglach Sírna Sáeglach ("the long-lived"), son of Dian mac Demal, son of Demal mac Rothechtaid, son of Rothechtaid mac Main, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He separated the province of Ulster f ...

, a great grandson of

Rothechtaid mac Main Rothechtaid, son of Maen, son of Óengus Olmucaid, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He came to power by killing the previous incumbent, his grandfather's killer Énna Airgdech, in the bat ...

. The ''Lebor Gabála'' synchronises his reign with that of Deioces of the Medes (694-665 BC). The chronology of Keating's ''Foras Feasa ar Éirinn'' dates his reign to 831–815 BC, that of the ''Annals of the Four Masters'' to 1197–1181 BC.

References

Legendary High Kings of Ireland Pseudohistory {{Ireland-royal-stub