Doctrina Jacobi

The Doctrina Jacobi is a Greek Christian polemical tract set in Carthage and written in Syria Palaestina. The composition of the document is generally dated to 634 or shortly afterwards.

It supposedly records a weeks-long discussion ending on July 13, 634, among Jews who have been forcibly baptized by order of the emperor. One of them, Jacob, has come to believe sincerely in Christianity; he instructs the rest about why they should also sincerely embrace their new faith. Halfway through, a Jewish merchant named Justus arrives and challenges Jacob to a debate. In the end, all of the participants are convinced to embrace Christianity, and Jacob and Justus return east. In addition to several partial Greek manuscripts, the text survives in Latin, Arabic, Ethiopic and Slavonic translations.