The book of Genesis tells us that God made a covenant with Abraham, promising him a glorious posterity on the condition that he and all his male descendents must be circumcised. For thousands of years thereafter, the distinctive practice of circumcision served to set the Jews apart from their neighbors. The apostle Paul rejected it as a worthless practice, emblematic of Judaism's fixation on physical matters. Christian theologians followed his lead, arguing that whereas Christians sought spiritual fulfillment, Jews remained mired in such pointless concerns as diet and circumcision. As time...

The author of this book recounts the history of the Ashkenazic Jewish experience in medieval western Europe from the 5th to 15th centuries, focusing on interaction between Jews and Christians during this formative period.

The book of Genesis tells us that God made a covenant with Abraham, promising him a glorious posterity on the condition that he and all his male descendents must be circumcised. For thousands of years thereafter, the distinctive practice of circumcision served to set the Jews apart from their neighbors. The apostle Paul rejected it as a worthless practice, emblematic of Judaism's fixation on physical matters. Christian theologians followed his lead, arguing that whereas Christians sought spiritual fulfillment, Jews remained mired in such pointless concerns as diet and circumcision. As time...