Crimthann mac Áedo (died 633)[1] was a King of Leinster from the Uí Máil branch of the Laigin.
[4] This same prince was slain by Crimthann's rival Fáelán mac Colmáin of the Uí Dúnlainge at the Battle of Duma Aichir in 628.
[5] Also, in that year the new high king Domnall mac Áedo (died 642) of the Cenél Conaill ravaged Leinster.
[6] Crimthann was defeated and slain at the Battle of Áth Goan in western Liffey by an alliance of his rival Faelan of the Ui Dunlainge with Faílbe Flann mac Áedo Duib (died 637), the king of Munster and Conall Guthbinn mac Suibni (died 635) of the Clann Cholmáin.
[7] The Clann Cholmáin aided the Ui Dunlainge rise to power in Leinster to further their ambitions in Meath.