This book discusses the history of church building throughout Venice, Siena and Florence in the Middle Ages. Contents: church building in the Middle Ages; Venice and St. Mark's; Siena and Our Lady of the Assumption: beginning of the Duomo and the Battle of Montaperti, story of the Duomo after 1260; Florence and St. Mary of the Flower: church of Arnolfo, dome of Brunelleschi. Also contains appendices on documents relation to the Duomo of Siena and irregularities of construction in Italian buildings of the Middle Ages.