Born in the 1490s, Anthonius Margaritha was the grandson, son, and brother of noted rabbis and was perhaps the best-known Jew of his generation in Germany to convert to Christianity. When he became a Christian in 1521, he began a series of writings that were built on his Jewish life and learning but were intended to reveal the defects of his former faith. These writings, including a translation of the Hebrew prayer book into German and a refutation of the faith, The Entire Jewish Faith (Der gantz J?disch glaub), are well known to scholars, but Margaritha himself has been studied largely as...