`  ``founded at the invitation of Olaf, one of the Norse kings``, the link is most likely wrong. It goes to a minor Norwegian king, but it's more likely Olaf I Godredsson, a king of Man (ruled 1104 until 1153), and the invitation was in 1134, according to the booklet for Rushen Abbey (ISBN 0 901106 42 9 by Manx National Heritage)   `