Sacha Stern

University College London

When bloodletting is dangerous:

medieval Jews between Talmudic heritage and Latin dies aegri

Bloodletting was a common medical practice in Antiquity and the Middle Ages, but it was important to do it at the right times. Working out the best times for bloodletting involved the disciplines of medicine, astrology, and calendar science. A list of bad days for bloodletting is found in the Babylonian Talmud, and is clearly of Jewish origin. This Talmudic text had no impact on bloodletting practices in the Cairo Genizah, but it was very influential among medieval European Jews. However, between the 12^th and 15^th centuries European Jews gradually adopted Christian bloodletting hemerological traditions, such as the Latin lists of dies aegri (‘bad days’). These Christian borrowings underwent a process of Judaization, with Julian calendar dates being replaced with equivalent dates in the Jewish calendar. A careful balance was thus maintained by Jews between deferring to the authority of Christian medicine and asserting their Jewish identity. This tells us something important about transfer of knowledge from Christians to Jews in medieval Europe, but also about how social groups differentiated themselves through temporal structures and daily schedules.

התכנסות לקפה וכיבוד קל בשעה 17:45, ליד חדר  449

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