This is a list of great powers during the medieval period. The term "great power" has only been used in historiography and political science since the Congress of Vienna in 1815.[1]Lord Castlereagh, the British Foreign Secretary, first used the term in its diplomatic context in 1814. Use of the term in medieval historiography is therefore idiosyncratic to each author. In historiography of the pre-modern period, it is more typical to talk of empires (itself a poorly-defined term, see list of empires).
The Byzantine Empire (Eastern Roman Empire) was the foremost Christian power in the early medieval period, but under pressure from the Islamic conquests and the Turkic expansion it declined in the high medieval period. It fell to Frankish conquest in 1204 and although restored in the 1260s it did not regain its former stature.
In the medieval history of Europe, Bulgaria's status as the Bulgarian Empire, wherein it acted as a key regional power (particularly rivaling Byzantium in Southeastern Europe[6]) occurred in two distinct periods: between the seventh and eleventh centuries, and again between the twelfth and fourteenth centuries. The two consecutive Bulgarian Empires are not treated as separate entities, but rather as one state restored after a period of Byzantine rule over its territory.
↑Jean Paul Roux: Historie des Turcs (Trans:Prof Dr.Aykut Kazancıgil - Lale Arslan Özcan) Kabalcı yayınevi, İstanbul, 2007, ISBN975-997-091-0Search this book on., p.205–205
Petitjean, P., Jami, C., Moulin, A. M., & Equipe REHSEIS (Centre national de la recherche scientifique (France)). (1992). Science and Empires: Historical Studies about Scientific Development and European Expansion. Dordrecht: Kluwer Academic Publishers.
Shepherd, W. R., & C.S. Hammond & Company. (1911). Historical Atlas. New York: Henry Holt and Co.
Stearns, Peter N. ed. The Encyclopedia of World History (2001).