Buchanan.
This prophecy was probably the immediate cause of the event which it foretold.

The disciples of this martyr, enraged at the cruel execution, formed a conspiracy against the cardinal; and having associated to them Norman Lesly, who was disgusted on account of some private quarrel, they conducted their enterprise with great secrecy and success.

Early in the morning, they entered the cardinal's palace, which he had strongly fortified, and though they were not above sixteen persons, they thrust out a hundred tradesmen and fifty servants, whom they seized separately, before any suspicion arose of their intentions; and having shut the gates, they proceeded very deliberately to execute their purpose on the cardinal.

That prelate had been alarmed with the noise which he heard in the castle, and had barricadoed the door of his chamber; but finding that they had brought fire in order to force their way, and having obtained, as is believed, a promise of life, he opened the door, and reminding them that he was a priest, he conjured them to spare him.

Two of the assassins rushed upon him with drawn swords; but a third, James Melvil, more calm and more considerate in villany, stopped their career, and bade them reflect, that this sacrifice was the work and judgment of God, and ought to be executed with becoming deliberation and gravity.
Then turning the point of his sword towards Beatoun, he called to him, "Repent thee, thou wicked cardinal, of all thy sins and iniquities, especially of the murder of Wishart, that instrument of God for the conversion of these lands: it is his death which now cries vengeance upon thee: we are sent by God to inflict the deserved punishment.