The most important book of the time having to do with these Sicilian complications was the _Political History of the Kingdom of Naples_, by Pietro Giannone. This was published just after the death of Clement and was promptly prohibited under the general policy that had been in force. By the time of Benedict XIV, the complications between the Holy See and the Governments of the Catholic States had been pretty well straightened out and the Index of Benedict contains therefore the titles of but very few political works. Through a special decree of the Congregation of January, 1729, was prohibited a history written by Count Franc. Maria Ottieri, and published in Rome in 1728, of the _War of the Spanish Succession, 1696–1725_. The book was condemned on the ground that it contained expressions injurious, if not libellous, concerning certain princes and political leaders. There seems in this case to have been no objection on theological or ecclesiastical grounds. The decree states that the condemnation had received the personal approval of Benedict XIII. Under the instructions of Benedict XIV, however, the title was taken out of the Index. In 1746, Benedict XIV ordered the prohibition of a treatise by Garrido, general of the Spanish Congregation of the Benedictines, which had been printed in Madrid in 1745 under the title: _Concordia prelatorum: Tractatus duplex de unione ecclesiarum et beneficiorum_, etc. This work was also condemned by the Spanish Inquisition, which was as heretofore under the control of the Dominicans. It is the contention of those upholding the reasonableness of the claims of the Church that there need be no conflict of authority between the powers spiritual and the powers temporal; that the allegiance and obedience should be entire towards the sovereign in matters temporal and entire towards the pope in matters spiritual. In the application of this apparently simple principle, it was inevitable that there should arise differences of interpretation. From the ecclesiastical point of view, it was claimed that all ecclesiastical property was to be classed with the matters spiritual; to the same class belonged of necessity ecclesiastical persons, thus securing for such persons immunities, both personal and real; while from these two claims arises the jurisdiction of the Church in matters both civil and criminal. In marriage, for instance, the sacrament is the essential thing, from which arises the inference that marriage is to be regulated by ecclesiastical law. Finally, every human act may be the subject of sin, and on this ground the Church has received divine precepts and has instituted ecclesiastical laws for the regulation of all actions.