Damien Janos (a cura di), Ideas in Motion in Baghdad and Beyond. Philosophical and Theological Exchanges between Christians and Muslims in the Third/Ninth and Fourth/Tenth Centuries, Brill, Leiden – Boston 2016 (Islamic History and Civilization 124), pp. 480, € 126, ISBN 9789004306028 (hardback) / 9789004306264 (e-book)