This appears to be the work of Fergalin in conjunction with Murchad Midi (died 715) the King of Uisnech of Clann Cholmáin and Murchad may have been Fergal's deputy ruler in the south.
This likely involves Fergalin and Murchad Midi, who was the King of Uisnech from Clann Cholmáin around 715 AD. Murchad may have been acting as a subordinate to Fergal in the southern region.