Claim: King Crandomna was joint ruler with Dunchad mac Conaingn until Conaing's death by Talocran in 654.
Evidence: He was co-ruler with Dúnchad mac Conaing until 654, after which he was apparently sole ruler. Dúnchad mac Conaing (or Dúnchad mac Dubáin) (died 654) was king of Dál Riata (modern western Scotland).