A converted theologian ignited a firestorm by demanding the destruction of Jewish religious texts.

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Johannes Pfefferkorn, a former Jew turned Catholic, spent years campaigning to seize and burn the Talmud. His crusade sparked a bitter, years-long pamphlet war against the humanist Johann Reuchlin, exposing deep divisions between the Dominican order and the intellectual movements of the early sixteenth century in Germany.

Born Joseph in 1469, Johannes Pfefferkorn converted to Catholicism in 1505 after a period of imprisonment for burglary. As an assistant to the Dominican prior Jacob van Hoogstraaten in Cologne, he began publishing pamphlets arguing that Jewish religious writings were inherently hostile to Christianity. His early work, such as the 1507 Der Judenspiegel, urged Jews to abandon usury and attend Christian sermons, while simultaneously defending them against ritual murder accusations. However, his rhetoric soon hardened significantly.

By 1509, Pfefferkorn’s stance had shifted to open hostility. He argued that every Jew was duty-bound to mock or kill Christians, advocating for the forced removal of Jewish children for Catholic education and the total destruction of the Talmud. Leveraging connections to the sister of Emperor Maximilian, he secured an imperial mandate in August 1509 to confiscate Hebrew books. This triggered a formal investigation led by Uriel von Gemmingen, which sought opinions from various universities and scholars, including the humanist Johann Reuchlin.

The ensuing conflict became a proxy war between the Dominicans and the humanists. While Pfefferkorn and the University of Cologne pushed for the destruction of the books, Reuchlin argued that most were harmless. Although the Emperor initially suspended his confiscation order in 1510, the pamphlet battle continued for years. Pfefferkorn was famously mocked in the Epistolæ obscurorum virorum, a satirical collection by young humanists supporting Reuchlin. Even after Pope Leo X condemned Reuchlin’s work in 1520, the legacy of this controversy remained a defining moment in the intellectual landscape of the Reformation era.

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