Some Frenchmen, it is said, had commenced pirates, and had plundered Scottish ships. The King chose Michael as his ambassador, sending him to Paris to demand justice and redress. The magician, however, made none of the ordinary preparations for so considerable a journey, but opened his Book of Might and read a spell therein; whereupon his familiar appeared in the form of a black horse, just as Folengo describes him. In this shape the demon carried his rider through the air with incredible speed. When the channel lay beneath them, he asked Michael what words the old wives in Scotland muttered ere they went to sleep. A less adroit wizard would have simply repeated the Paternoster, and thus furnished the excuse sought by the demon, who would then have hurled his rider into the sea. Michael, however, contented himself by sternly replying: ‘What is that to thee? Mount Diabolus, and fly;’ and, the demon being thus outwitted and compelled, the presently arrived in Paris. Finding the French King unwilling to hear his representations, Scot asked him to delay giving a final refusal till he should have heard the horse stamp three times. At the first hoof-stroke, all the bells in Paris rang. At the second, three towers in the palace fell; and the horse had raised his foot to stamp once more, when the King cried, ‘Hold, and yielded him to do as his cousin of Scotland desired.

Sir Walter Scott

Ley of the Last Minstrel note 'Y'.