All tradition assures us that the chief occupation of Scot’s life was found at the Court of Frederick II., King of Sicily, and afterwards Emperor of Germany: a Prince deservedly famous, not only for his own talent, but for the protection and encouragement he afforded to men of learning. A manuscript in the Laurentian Library,[31] hitherto unnoticed in this connection, seems to throw some light upon the time and manner of this employment: points that have always been very obscure. The volume is a collection of _Occulta_, and at p. 256 we find the following title, ‘An Experiment of Michael Scot the magician.’ What follows is of no serious importance: such as it has we shall consider in speaking of the Master’s legendary fame. The concluding words, however, are of great interest, especially when we observe that this part of the manuscript, though written between 1450 and 1500, is said[32] to have been copied ‘from a very ancient book.’ The colophon runs thus: ‘Here endeth the necromantic experiment of the most illustrious doctor, Master[33] Michael Scot, who among other scholars is known as the supreme Master; who was of Scotland, and servant to his most distinguished chief Don Philip,[34] the King of Sicily’s clerk;[35] which experiment he contrived[36] when he lay sick in the city of Cordova. Finis.’ Taking the persons here named in the order of their rank, we notice first the great Emperor Frederick II., the patron of Michael Scot. It is worth remark that he is styled simply ‘King of Sicily,’ a title which belongs to the time previous to 1215, when he obtained the Imperial crown. This is a touch which seems to give high originality and value to the colophon. We may feel sure that it was not composed by the fifteenth century scribe, who would certainly have described Frederick in the usual style as Emperor and Lord of the World. He must have copied it, and everything leads one to suppose that he was right in describing the source from which he drew as ‘very ancient.’