: Connacht was the Emperor of the Cath Bruig empire. Then
: he disappeared/died. At the time of the Great War,
: Ceiscoran was the current Emperor of the Cath Bruig,
: and therefore the Heron were sworn to him. When he
: died at the sacking of Muirthemne, the Heron did not
: think to immediately swear to his killer :) Balor was
: Connacht reincarnated, but that didn't mean he had a
: claim to the throne.
Plus they weren't Herons anymore; they were Journeymen, and not beholden to anyone. By the time they became Herons again, Balor was dead and Alric was the Emperor.