Nikephoros Kallistos Xanthopoulos

Nikephoros Kallistos Xanthopoulos (Greek: Νικηφόρος Κάλλιστος Ξανθόπουλος; Latinized as Nicephorus Callistus Xanthopulus; c.1256 – 1335) was a Greek ecclesiastical historian and litterateur of the late Byzantine Empire. His most popular work, the voluminous Ecclesiastica historia, constitutes a significant documentary source on primitive Christianity and its doctrinal controversies, as well as for hagiographical, liturgical, and legendary texts from Byzantine culture.