The Ciannachta are mentioned as having participated in the expedition of the high king Donnchad Midi (died 797) against Leinster.
The Síl nÁedo Sláine had been subdued in 786 by the high king Donnchad Midi (died 797).
The high king Donnchad Midi (died 797) had campaigned against Leinster in 780 and then made peace.
The Síl nÁedo Sláine had suffered a crushing defeat in 786 at the hands of Donnchad Midi (died 797), the high king from the rival Clann Cholmáin.
Niall was an old king and offered no threat to the high king Donnchad Midi (died 797) who was imposing his authority on Brega at this time.
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