In 1341 in Aragon, a Jewish convert to Christianity was sentenced to death, only to be pulled from the burning stake and into a formal religious interrogation. His confession was as astonishing to his inquisitors as his brush with mortality is to us: the condemned man described a Jewish conspiracy to persuade recent converts to denounce their newfound Christian faith. His claims were corroborated by witnesses and became the catalyst for a series of trials that unfolded over the course of the next twenty months. Between Christian and Jew closely analyzes these events, which Paola Tartakoff...

A radical shift took place in medieval Europe that still shapes contemporary intellectual life: freeing themselves from the fixed beliefs of the past, scholars began to determine and pursue their own avenues of academic inquiry. In Knowledge True and Useful, Frank Rexroth shows how, beginning in the 1070s, a new kind of knowledge arose in Latin Europe that for the first time could be deemed “scientific.” In the twelfth century, when Peter Abelard proclaimed the primacy of reason in all areas of inquiry (and started an affair with his pupil Heloise), it was a scandal. But he was not the...