According to the Sanas Cormaic,[REF] Crimthand Mór mac Fidaig built a great fortress in Cornwall known as Dind Traduí or Dinn Tradui (Dun Tredui/e, fortress of the three ramparts) [REF].
Crimthand Mór mac Fidaig and the early Uí Liatháin may have belonged to the historical Attacotti (circa 368).