The littoral of the Great Sea has long been viewed as a major place of contact, conflict and exchange for groups belonging to the three Abrahamic religions: Judaism, Christianity and Islam. This course approaches the encounters of different religions and ethnicities in such a manner as to introduce students not only to the classic historiography on the subject, but also to the main controversies and debates now current in scholarship. Our analysis and evaluation of the connections that developed between individuals and communities will focus on the High Middle Ages.