I have found in the February, 1907 proceedings of the IoM Natural History and Antiquitarian Society references to clan "Molvurra" (Morrison) as allies of King Harald Olafsson in his c. 1237 - 1238 dispute with kinsman Loughlin over the rule of Man. I need help in verifying this information (Chronicon Manniae makes reference to the dispute but not Molvurra).