Mac Ian had taken the oaths.

He had taken them, indeed, too late to be entitled to plead the letter of the royal promise; but the fact that he had taken them was one which evidently ought not to have been concealed from those who were to decide his fate.
By a dark intrigue, of which the history is but imperfectly known, but which was, in all probability, directed by the Master of Stair, the evidence of Mac Ian's tardy submission was suppressed.

The certificate which the Sheriff of Argyleshire had transmitted to the Council at Edinburgh, was never laid before the board, but was privately submitted to some persons high in office, and particularly to Lord President Stair, the father of the Secretary.

These persons pronounced the certificate irregular, and, indeed, absolutely null; and it was cancelled.
Meanwhile the Master of Stair was forming, in concert with Breadalbane and Argyle, a plan for the destruction of the people of Glencoe.

It was necessary to take the King's pleasure, not, indeed, as to the details of what was to be done, but as to the question whether Mac Ian and his people should or should not be treated as rebels out of the pale of the ordinary law.