sentences:  By this point in time he is already Bishop of Moray.The date of his accession is not known; all that can be said is that he must have become bishop some time, perhaps some considerable time, after 1128, the last certain point in the "floruit" of his predecessor Gregoir.William witnesses a charter of King Máel Coluim IV at some date after 19 December 1154, when Christian was consecrated as Bishop of Galloway.