 This tells how Áedán mac Gabráin of Dál Riata was Brandub's twin brother, exchanged at birth for one of the twin daughters of Gabrán, born the very same night, so that each family might have a son.Whether the tale is entirely fabricated, or whether it echoes a foster-relationship between Brandub and Áedán, can only be surmised.According to this story Brandub's father Echu had been expelled from the kingdom by Fáelán mac Síláin, his predecessor in the kingship of the Uí Chennselaig and had gone to live in Dál Riata at the court of Gabrán where Brandub and Aedán were fostered together.