The Talmud's Red Fence explores how rituals and beliefs concerning menstruation in the Babylonian Talmud and neighboring Sasanian religious texts were animated by difference and differentiation. It argues that the practice and development of menstrual rituals in Babylonian Judaism was a product of the religious terrain of the Sasanian Empire, where groups like Syriac Christians, Mandaeans, Zoroastrians, and Jews defined themselves in part based on how they approached menstrual impurity. It demonstrates that menstruation was highly charged in Babylonian Judaism and Sasanian Zoroastrian, where...