Justinas Pranaitis

Justinas Bonaventūra Pranaitis (; 27 July 1861 – 28 January 1917) Stephen E. Atkins notes that in addition to mistranslation, many are taken out of context. Edmund Levin observes that Pranaitis was exposed as a fraud, ignorant of Semitic languages, and that the book was plagiarized from other antisemitic works, even down to typographical errors. Arthur Kurzweil notes it relies on earlier falsifications from Johann Eisenmenger and others. Ronald Modras and Ben-Zion Bokser note that he plagiarized Eisenmenger and August Rohling as well.

In 1912, Pranaitis testified in the blood libel case of Menahem Mendel Beilis in Russia. Beilis was accused of murdering a Christian child to take his blood for alleged Jewish rituals. Pranaitis was called as an expert witness to testify to the Talmudic hatred of Christians, as described in his book. His credibility rapidly evaporated, however, when the defence demonstrated his ignorance of some simple Talmudic concepts and definitions, such as hullin, erubin, Beilis was found not guilty.

According to a letter from Baron Rothschild to Vatican Secretary of State Merry Del Val, during a deposition for the trial Pranaitis claimed that he couldn't find a record of Innocent IV's papal bull Sicut Iudaeis against the blood libel in the "usual works of reference", and suspected that it was a forgery. Merry Del Val replied that it was authentic, although the message didn't arrive in time to affect the trial.

Death Pranaitis was killed at the hands of the Bolsheviks on in Saint Petersburg.