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Hace 1 día · PhD Thesis, Free University, Berlin. 960 p. [in German] Ekonomou, Andrew J. 2007. Byzantine Rome and the Greek Popes: Eastern influences on Rome and the papacy from Gregory the Great to Zacharias, A.D. 590–752. Lexington Books. Gregorovius, Ferdinand. History of the City of Rome in the Middle Ages. Fields, Nic (2007).
