Medieval Greece

The history of the Byzantine Empire is described by scholar August Heisenberg as the history "of the Roman state of the Greek nation, that turned Christian". The division of the empire into East and West and the subsequent collapse of the Western Roman Empire were developments that constantly accentuated the position of the Greeks in the empire and eventually allowed them to become identified with it altogether. The leading role of Constantinople began when Constantine the Great turned Byzantium into the new capital of the Roman Empire, henceforth to be known as Constantinople, placing the city at the centre of Hellenism a beacon for the Greeks that lasted to the modern era.

The figures of Constantine the Great and Justinian dominated during 324–610. Assimilating the Roman tradition, the emperors sought to provide the basis for subsequent developments and for the formation of the Byzantine Empire. Efforts to secure the borders of the Empire and to restore the Roman territories marked the early centuries. At the same time, the definitive formation and establishment of the Orthodox doctrine, but also a series of conflicts resulting from heresies that developed within the boundaries of the empire marked the early period of Byzantine history.

In the first period of the middle Byzantine era (610–867) the empire was attacked both by old enemies (Persians, Langobards, Avars and Slavs) as well as by new ones, appearing for the first time in history (Arabs, Bulgarians). The main characteristic of this period was that the enemy attacks were not localized to the border areas of the state but they were extended deep beyond, even threatening the capital itself. At the same time, these attacks lost their periodical and temporary character and became permanent settlements that transformed into new states, hostile to Byzantium. Changes were also observed in the internal structure of the empire which was dictated by both external and internal conditions. The predominance of the small free farmers, the expansion of the military estates and the development of the system of themes, brought to completion developments that had started in the previous period. Changes were noted also in the sector of administration: the administration and society had become immiscibly Greek, while the restoration of Orthodoxy after the iconoclast movement, allowed the successful resumption of missionary action among neighbouring peoples and their placement within the sphere of Byzantine cultural influence. During this period the state was geographically reduced and economically damaged, since it lost wealth-producing regions; however, it obtained greater lingual, dogmatic and cultural homogeneity.

The year 1204 marks the beginning of the late Byzantine period, when probably the most important event for the Empire occurred. Constantinople was lost for the Greek people for the first time, and the empire was conquered by Latin crusaders and would be replaced by a new Latin one, for 57 years. In addition, the period of Latin occupation decisively influenced the empire's internal development, as elements of feudality entered aspects of Byzantine life. In 1261 the Greek empire was divided between the former Greek Byzantine Comnenos dynasty members (Epirus) and Palaiologos dynasty (the last dynasty until the fall of Constantinople). After the gradual weakening of the structures of the Greek Byzantine state and the reduction of its land from Turkish invasions, came the fall of the Greek Byzantine Empire, at the hands of the Ottomans, in 1453, when the Byzantine period is considered to have ended.

It must be pointed out that the term "Byzantine" is a contemporary one established by historians. People used to call the Empire from the 10th century on as the Greek Empire as well as Romeo-Greek before that time; that's why Greeks call themselves sometimes as Romioi in a colloquial form. The Romeo term was used sometimes because of the legal tradition left in many aspects of the political administration of the Empire. It must be added also that many empires all around Europe had been using this term, in Addition to the Greek Byzantines, like the Carolingians, or the Heiliges Romisches Reich (Latin Sacrum Romanum Imperium) of the Germans looking themselves as the legitimate heirs of the Roman Empire.