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At least three fragments places in Nikephoros Kallistos Xanthopoulos‘   narrative of the Avar wars have no parallels either in Theophylakt Simokatta   or in Theophanes. The nature of the evidence cited in these passages cannot   be a logical reconstruction based on the texts of either of the mentioned   authors. This means that Xanthopoulos, the Church historian of the 14th   century, had at his disposal a source on the 6th century which has not come   down to us

The Avar-Byzantine wars of the late sixth century as depicted by Nikephoros Kallistos Xanthopoulos: A new source?