Eochaid Fiadmuine, son of Congal Coscarach, was joint High King of Ireland with his brother Conaing Begeaglach (Eochaid ruled the south, Conaing the north). They ruled for five years, until Eochaid was killed and Conaing deposed by Lugaid Lámdearg. The office of High King of Ireland (Irish: Ard Rí Érenn) was in origin a pseudohistorial construct of the eighth century that placed a king of all Ireland atop the fragmented pyramid of kingship that actually existed at that time. ... Conaing Begeaglach, son of Congal Coscarach, was joint High King of Ireland with his brother Eochaid Fiadmuine (Eochaid ruled the south, Conaing the north). ...

The High Kingship of Ireland was a pseudohistorical construct of the eighth century AD, a projection into the distant past of a political entity that did not become reality until the ninth century. ... Conaing Begeaglach, son of Congal Coscarach, was joint High King of Ireland with his brother Eochaid Fiadmuine (Eochaid ruled the south, Conaing the north). ... Signature page from the Annals of the Four Masters Entry for A.D. 432 The Annals of the Four Masters or the Annals of the Kingdom of Ireland by the Four Masters are a chronicle of medieval Irish history. ... Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish clergyman, poet and historian. ...