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References
- ↑ Leonard of Chios: "Johannis Grandi Alemani", where Grandi can also mean "the great" in Italian
- ↑ Georgios Sphrantzes: "Johannes the German"
- ↑ Bartusis, Mark, Late Byzantine Army
- ↑ Runciman, Steven, Fall of Constantinople 1453, page 84
- ↑ Nicol, Donald, Last Centuries of Byzantium. Cambridge University Press, 1993 [2nd edition]. Chapter 18.
- ↑ The Fall of Constantinopla Archived 6 February 2007 at the Wayback Machine
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