In 695 Congalach and his kinsman Áed mac Dlúthaig (died 701) of the Síl nDlúthaig of Fir Cúl Breg killed Fínsnechta Fledach, the High King of Ireland, and his son Bresal of the Clan Fínsnechtai sept at Grellaigh Dollaith.
Diarmait himself was killed in 689 as part of the old feud by Áed mac Dlúthaig (died 701) of the Fir Cúl Breg sept of Síl nÁedo Sláine.
He was the son of Áed mac Dlúthaig (died 701), King of Fir Cúl and great-grandson of Ailill Cruitire mac Áedo Sláine (died 634), a king of Brega.
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