For the Byzantine Empire, at the end of the first quarter of the 11thcentury, a new period starts, which in the historiography opinion is generalized as the period of the rule of bureaucratic aristocracy of the capital city. This covers the period 1025-1081, which was characterized by disintegration in the state system and failures in the field of internal and foreign politics. The political crisis at its beginning did not appear clearly, because bureaucratic aristocracy came to power following the thriving (...) period that Byzantine Empire had experienced until then, known as the golden age of the empire. After a calm developmental beginning, the period commenced to be characterized by some developments of decentralizing character. Heirs of the then Byzantine Emperor, Basil II. could not resist enough the separatist movements of feudal and military leaders. Despite these trends towards weakening and separatism, Empire reached that thanks to Komnena dynasty to successfully withstand the challenges that were created by Seljuk Turks and Norman Crusaders. It partially reclaimed its former reputation to continue with the political existence for some more centuries. In these developments, the Byzantine Emperors were supported or often were objected by the non-Byzantine feudal elements that in various cases came from Albania, Bulgaria, Rasha and Zeta. (shrink)