Byzantinism, or Byzantism, is the political system and culture of the Byzantine Empire, and its spiritual successors, in particular, the Christian Balkan states (Bulgaria, Greece, Serbia) and Orthodox countries in Eastern Europe (Georgia, Ukraine, Belarus and most importantly, Russia). The term byzantinism itself was coined in the 19th century. The term has primarily negative associations, implying complexity and .
This negative reputation stressed the confusing complexities of the Empire's and the elaborateness of its court ceremonies. Likewise, the "Byzantine system" also suggests a penchant for intrigue, plots and assassinations and an overall unstable political state of affairs. The term has been criticized by modern scholars for being a generalization that is not very representative of the reality of the .
The Byzantine Empire is a modern term applied by Westerners to the medieval Roman Empire and thus had a complex system of and bureaucracy which was derived from earlier Roman systems. At the apex of the pyramid stood the Emperor, sole ruler and divinely ordained, and beneath him a multitude of officials and court functionaries operated the administrative machinery of the state. A key component of state power was the prestige of the Imperial institution and its long antiquity. Ceremony and the granting of both honorific titles and valuable offices was therefore extensive and elaborate.
Over the nearly fifteen hundred years of the empire's existence, different titles were adopted and discarded, and many lost or gained prestige. By the time of Heraclius in the 7th century many of the early Roman titles, grounded in the Latin language and the traditions of the old Roman republic had become obsolete in the now mostly Greek-speaking empire, although Latin survived longer in law and in the military. Heraclius formally changed the official language to Greek from Latin in 620. Titles inspired by their Greek tradition, often only rough approximation of Latin concepts, became common (i.e. "basileus" [βασιλεύς] instead of "caesar" or "augustus" for the title of the emperor himself). Other titles changed meaning (for example, "Patriarch") or were devalued with time (such as "consul").