The invasion, we see, had been most rapid. In less than fifteen years, every important city had followed the movement, and was ready to establish printing offices. If we may credit a certain controverted document, Charles VII. had on the 3rd of October, 1458, sent to Mayence one of the best medal engravers of the Mint of Tours to study the process of which marvels were spoken: "The 3rd of October, 1458, the King having learned that Messire Guthenberg, living at Mayence, in the country of Germany, a dexterous man in carving and making letters with a punch, had brought to light the invention of printing by punches and types, desirous of inquiring into such a treasure, the King has commanded the generals of his mints to nominate persons well instructed in the said cutting and to send them secretly to the said place to inform themselves of the said mode and invention, to understand and learn the art of them, in order to satisfy the said Lord King; and it was undertaken by Nicholas Jenson, who took the said journey to bring intelligence of the said art and of the execution of it in the said kingdom, which first has made known the said art of impression to the said kingdom of France" (Bibliothèque de l'Arsenal, Hf 467, pp. 410, 411). Nicholas Jenson on his return met with a cool reception from Louis XI., who did not continue the works of his father. It may be supposed that this coolness was the cause of his expatriating himself and retiring to a place where his industry could be better exercised. Ten years after the above mission we find him established at Venice, his art of engraver of letters joined to that of printer. His Eusebius, translated by Trapezuntius, and his Justinian, were composed in 1470 with such marvellous and clear types that from that day the best typographers have imitated his founts. In spite of its success, he did not confine himself to these letters, but he made use also of Gothic, in which he printed by preference pious books. [Illustration: Fig. 9.--Imprint of Nicholas Jenson to a Justinian, printed in 1470 at Venice. This type has prevailed up to now.]