Áed mac Echach Tirmcharna (died 575)[1] was a King of Connacht from the Uí Briúin branch of the Connachta.
Geoffrey Keating states that Diarmait held a feast at Tara at which Áed's son Curnán mac Áedo (died 559) slew a nobleman.
As a result Columba organized a confederacy of the northern Uí Néill including the Cenél Conaill with Áed of Connacht against Diarmait.
Charles-Edwards places this battle in later Cenel Caipre Droma Cliab territory in the region between the Northern Uí Néill and the Connachta stating that Diarmait was on the offensive and tried to cut the allies off.
[5] However, Hubert Knox believed the Uí Briúin in fact originated near Annaghdown,[6] which would explain this situation.