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* The Cambridge Medieval History, Volume IV Part I. Cambridge: University Press, 1966. * Runciman Bart., Steven Sir. The Emperor Romanus Lecapenus and his Reign. Cambridge: University Press, 1929. * Toynbee, Arnold. Constantine Porphyrogenitus and his world. Oxford, 1973.
→References: fix format
==Tetragamy==
==References==
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