Galileo's great work the Dialogue on the Ptolemaic and Copernican Systems was finally concluded in the beginning of March 1630. As a mark of the affection he felt for his pupil and patron and also that the work might appear under the most favorable auspices it was dedicated to the Grand Duke Ferdinand. But neither the astronomer's fame nor the Grand Duke's protection was sufficient to insure the appearance of the book. The sanction of the authorities was necessary ere it could be printed and in order to obtain this with as little delay as possible Galileo was advised by Ciampoli and Castelli to go himself to Rome. Riccardi Master of the Sacred Palace had given his word that as far as he was concerned Galileo should meet with no difficulty in obtaining the desired license. The Barbenm were all well disposed. The Pope had expressed his regret to Campanella at the prohibition by the Decree of 1616 of the Copernican theory and had said distinctly that had it depended on him that decree would not have been published.
Ciampoli though he could not venture to speak with absolute certainty yet was of opinion that the surest way to success lay in Galileo's own personal influence and in his rare powers of persuasion.