'At a time when the conflict in Iraq, and the more recent uprisings in Syria, Bahrain and in Saudi Arabia's Eastern Province, have prompted a resurgence of essentialist generalisations on the Sunni-Shia divide, this collection of brilliant contributions by leading scholars from various disciplines is a welcome reminder of the complexity of the sectarian question in Islam which does not simply derive from textual and interpretative divergences, but is also socially constructed and politically instrumentalised.'