On arriving at Basel, Erasmus plunged at once into the work of Froben’s publishing office. During his first year in Basel, in addition to revising his _Encomium Moriæ_, and preparing for the press successive editions of the _Adagia_ and the _De Copia_ (Book of Similes), he gave arduous labour to the _S. Jerome_, the investment in which he shared with Froben, and to another great undertaking, a complete edition of the works of Seneca. He also began a series of translations from Plutarch, and, a little later, undertook the editorial work on the Froben edition of the New Testament. In 1515, while on a third visit to England, Erasmus wrote his treatise on the _Education of a Christian Prince_ (_Institutio Principis Christiani_), which was printed by Froben in the year following. The prince on whose behalf the essay had been prepared, and to whom it was dedicated, was Charles of Austria, the Arch-duke of Burgundy, then a lad of fifteen, who was afterwards known to history as the Emperor Charles V. Erasmus had visited Brussels in 1513, and, while there, had been appointed a Councillor to the young prince. The treatise is spoken of by biographers as sound in counsel and wholesome in tone, but as possessing no very distinctive importance, and Erasmus himself speaks slightingly of it. The essay written by Erasmus for the guidance of the future emperor will naturally be compared with the more famous treatise of Machiavelli, _The Prince_, which was composed at about the same time, probably in 1516. _The Prince_ was prepared for the private use of Lorenzo de’ Medici, and was not designed for publication. It was put into print in Florence about 1520, and despite the harsh criticisms that have been brought upon it for what in modern times would be termed its “Machiavellian” morality, it is to-day, nearly four centuries after its publication, considered as belonging to the world’s literature.