In the period before Ruaidrí ua Canannáin rose to prominence, the Cenél nEógain heir apparent to the High Kingship, Muirchertach mac Néill, was killed in battle in 943, while the High King, Donnchad Donn of Clann Cholmáin, died the following year.
The Cenél nEógain heir apparent to the High Kingship was killed in battle in 943. This was in the period. Ruaidrí ua Canannáin rose to prominence. The High King died the following year. The High King was Donnchad Donn of Clann Cholmáin. Muirchertach mac Néill was the Cenél nEógain heir apparent to the High Kingship.