False.

https://www.henrymakow.com/maurice_joly_plagiarized_proto.html

Reading Kerry Bolton's monograph "The Protocols of Zion In Context" (Renaissance Press, 2003) it became obvious that Joly was plagiarizing from The Protocols and not vice-versa.

Joly, a Jew whose real name was Joseph Levy, was a lifelong Mason and member of the "Lodge of Mizraim" where the Protocols document originated. He was the protege of Adolph Cremieux (Isaac Moise Cremieux 1796-1880) the head of the lodge, founder of the Alliance Israalite Universelle and a Minister in the Jewish-backed government of Leon Gambetta.

The plot is described in the Protocols as "centuries-old." It most likely predates "Dialogue." Joly was well versed in the Protocols and borrowed from it to flesh out the unpopular authoritarian position of Machiavelli, which he ascribed to Napoleon III.

Joly, who committed suicide in 1879, was in the habit of "borrowing." He is accused of plagiarizing a popular novel by Eugene Sue, namely "Les Mystares du Paris." (1845) Also, his work is predated by another of Cremieux's proteges, Jacob Venedy, entitled, "Machiavelli, Montesquieu, Rousseau." (1850)

In 1884 Mme. Justine Glinka, the daughter of a Russian General living in Paris, hired Joseph Schorst, a member of Joly's Mizraim Lodge to obtain sensitive information. For the sum of 2500 francs, Schorst provided Glinka with "The Protocols of the Elders of Zion." He was subsequently tracked down and murdered in Egypt.