Eisenmenger before his death, and his heirs after him, knowing that the king of Prussia was inclined to listen to accusations against the Jews, had applied to him to entreat Emperor Leopold to release the book against the Jews, entitled "Judaism Unmasked," from ban and prohibition. Frederick I interested himself warmly in the matter, and sent a kind of petition to Emperor Leopold I (April 25, 1705) very characteristic of the tone of that time. The king represented that Eisenmenger had sunk all his money in this book, and had died of vexation at the imperial prohibition. It would seem a lowering of Christianity if the Jews were so powerful as to be able to suppress a book written in defense of Christianity and in refutation of Jewish errors. There was no reason to apprehend, as the Jews pretended, that it would incite the people to a violent onslaught against them, since similar writings had lately appeared which had done them no harm. Eisenmenger's book aimed chiefly at the promotion of Christianity, so that Christians might not, as had repeatedly happened some years ago, be induced to revolt from it and become adherents of Judaism. But Emperor Leopold would not remove the ban from Eisenmenger's book. King Frederick repeated his request three years later, at the desire of Eisenmenger's heirs, to Emperor Joseph I. With him also King Frederick found no favorable hearing, and the 2,000 copies of "Judaism Unmasked" remained at Frankfort under ban for forty years. But with Frederick's approval a second edition was brought out at Königsberg, where the imperial censorship had no power. For the moment it had no such effect as the one side had hoped and the other feared; but, later on, when the rights of Jews as men and citizens were considered, it proved an armory for malicious or indolent opponents.