Nicephorus Callistus Xanthopoulos

Also spelled  Nikephoros Kallistos Xanthopoulos   Byzantine historian and litterateur whose stylistic prose and poetry exemplify the developing Byzantine humanism of the 13th and 14th centuries and whose 23-volume Ecclesiasticae historiae (“Church History”), of which only the first 18 volumes survive, constitutes a significant documentary source for material on primitive Christianity, its doctrinal controversies