(University of Pennsylvania Press) In this book, Simonsohn focuses on Christian and Jewish legal behavior, while under the authority of Muslims, during the late seventh to early 11th centuries in the region spanning from Iraq to what is now Tunisia. He shows how legal boundaries between faiths were much more permeable than imagined and that religious elites reacted by strengthening those communal boundaries. Simonsohn is an affiliate of the Martin Buber Society of Fellows at the Hebrew University of Jerusalem.