This is the fourth and final volume in a series which presents a complete corpus of all the church buildings that were built, rebuilt or simply in use in the Crusader Kingdom of Jerusalem between the capture of Jerusalem by the First Crusade in 1099 and the loss of Acre in 1291. This volume deals with the major coastal cities of Acre and Tyre, which were both in Frankish hands for almost two centuries, and also contains addenda and corrigenda to volumes 1-3. It describes and discusses some 120 churches and chapels that are attested by documentary or surviving evidence, accompanied where possible by plans, elevation drawings and photographs. This is an indispensable work of reference to all those concerned with the medieval archaeology of the Holy Land, the history of the Church in the Crusader Kingdom of Jerusalem and the art and architecture of the Latin East.