The cult of St Demetrius is of considerable age but it peaked with the emergence of his city, Thessalonica, as a prominent political and cultural centre in late Byzantium. This book examines the intensification of his popularity and veneration in the late Middle Ages and his impact on contemporary thought and ritual. The encomia written in the saint’s honour are significant historical and literary monuments and in their suggestiveness and beauty they are on a level with many better-known works in medieval Greek. Indeed, the encomia have added historical interest because of the prominence of those who wrote them. The likes of Nicholas Kavasilas, Gregory Palamas, Constantine Harmenopoulos and Symeon of Thessalonica were the elite of late Byzantium in intellect and personal influence, while Nikephoros Gregoras was perhaps the finest of Byzantine minds. With their clear links to individual authors, the encomia on St Demetrius present opportunities to the historian and the literary critic, which are fully explored in this book, the first to give them sustained scholarly attention.