The Demography of the Byzantine Empire concerns the composition, distribution, and social structure of the population of the Byzantine Empire, shaped by factors such as taxation, occupation, religion, and locality.

The vast majority of inhabitants lived in rural communities as peasants. Their agricultural labour underpinned the imperial economy, while soldiers formed a constant and highly visible presence through near-permanent warfare. The urban populations included the poor, artisans, teachers, clergy, and merchants, with Constantinople standing apart as a demographic and economic magnet. Christian institutions profoundly influenced social life, generating extensive networks of charity, education, and ecclesiastical administration. Although literacy, wealth, and legal status varied sharply by gender, region, and class, Byzantine society was marked by significant interaction between lay and clerical life, town and countryside, and state and economy. Together, these groups constituted a long-lived and adaptable population whose demographic patterns evolved over more than a millennium of imperial history.

Population

The population of the Byzantine Empire encompassed all ethnic and tribal groups living there, mainly Rhomaioi (Greek-speaking Romans), but also Albanians, Armenians, Assyrians, Bulgarians, Goths, Jews, Kartvelians, Latini, Levantine Arabs, Serbs and Croats, Thracians, Thraco-Romans, Illyro-Romans,Tzans, Vlachs and other groups.

Scholars associate the Roman, Hellenic, and Christian imperial identities with the general population, but there is ongoing debate about how these and other regional identities blended together.

As many as 27 million people lived in the empire at its peak in 540, but this fell to 12 million by 800. Although plague and territorial losses to Arab Muslim invaders weakened the empire, it eventually recovered and by the near end of the Macedonian dynasty in 1025, the population is estimated to have been as high as 18 million. A few decades after the recapture of Constantinople in 1282, the empire's population was in the range of 3–5 million; by 1312, the number had dropped to 2 million. By the time the Ottoman Turks captured Constantinople, there were only 50,000 people in the city, one-tenth of its population in its prime.

Society While social mobility was not unknown in Byzantium the order of society was thought of as more enduring, with the average man regarding the court of Heaven to be the archetype of the imperial court in Constantinople.. This society included various classes of people that were neither exclusive nor immutable. The most characteristic were the poor, the peasants, the soldiers, the teachers, entrepreneurs, and clergy.

The poor According to a text dated to AD 533, a man was termed "poor" if he did not have 50 gold coins (aurei), which was a modest though not negligible sum.. The Byzantines were heirs to the Greek concepts of charity for the sake of the polis; nevertheless it was the Christian concepts attested in the Bible that animated their giving habits,. and specifically the examples of Basil of Caesarea (who is the Greek equivalent of Santa Claus), Gregory of Nyssa, and John Chrysostom. The number of the poor fluctuated in the many centuries of Byzantium's existence, but they provided a constant supply of muscle power for the building projects and rural work. Their numbers apparently increased in the late fourth and early fifth centuries as barbarian raids and a desire to avoid taxation pushed rural populations into cities..

Since Homeric times, there were several categories of poverty: the ptochos (, "passive poor") was lower than the penes (, "active poor").. They formed the majority of the infamous Constantinopolitan mob whose function was similar to the mob of the First Rome. However, while there are instances of riots attributed to the poor, the majority of civil disturbances were specifically attributable to the various factions of the Hippodrome like the Greens and Blues.. The poor made up a non-negligible percentage of the population, but they influenced the Christian society of Byzantium to create a large network of hospitals (iatreia, ) and almshouses, and a religious and social model largely justified by the existence of the poor and born out of the Christian transformation of classical society..

Peasantry Byzantine state and society relied on the Hellenistic system of joint tax liability due to the easy handling, fast and simple revenue for the state from the different towns and villages chorio, komai mostly made up of peasants, who were the main income. There are no reliable figures as to the numbers of the peasantry, yet it is widely assumed that the vast majority of Byzantine Greeks lived in rural and agrarian areas.. In the Taktika of Emperor Leo VI the Wise (r. 886–912), the two professions defined as the backbone of the state are the peasantry (geōrgikē, , "farmers") and the soldiers (stratiōtikē, ).

Peasants lived mostly in villages, whose name changed slowly from the classical kome () to the modern chorio ().. While agriculture and herding were the dominant occupations of villagers they were not the only ones. There are records for the small town of Lampsakos, situated on the eastern shore of the Hellespont, which out of 173 households classifies 113 as peasant and 60 as urban, which indicate other kinds of ancillary activities.

The Treatise on Taxation, preserved in the Biblioteca Marciana in Venice, distinguishes between three types of rural settlements, the chorion (Greek: χωρίον) or village, the agridion (Greek: αγρίδιον) or hamlet, and the proasteion (Greek: προάστειον) or estate. According to a 14th-century survey of the village of Aphetos, donated to the monastery of Chilandar, the average size of a landholding is only 3.5 modioi (0.08 ha).. Taxes placed on rural populations included the kapnikon (Greek: καπνικόν) or hearth tax, the synone (Greek: συνονή) or cash payment frequently affiliated with the kapnikon, the ennomion (Greek: εννόμιον) or pasture tax, and the aerikon (Greek: αέρικον, meaning "of the air") which depended on the village's population and ranged between 4 and 20 gold coins annually.; .

Their diet consisted of mainly grains and beans and in fishing communities fish was usually substituted for meat.. Bread, wine, and olives were important staples of Byzantine diet with soldiers on campaign eating double-baked and dried bread called paximadion (Greek: παξιμάδιον).. As in antiquity and modern times, the most common cultivations in the choraphia (Greek: χωράφια) were olive groves and vineyards. While Liutprand of Cremona, a visitor from Italy, found Greek wine irritating as it was often flavoured with resin (retsina) most other Westerners admired Greek wines, Cretan in particular being famous..

While both hunting and fishing were common, the peasants mostly hunted to protect their herds and crops.. Apiculture, the keeping of bees, was as highly developed in Byzantium as it had been in Ancient Greece.. Aside from agriculture, the peasants also laboured in the crafts, fiscal inventories mentioning smiths (Greek: χαλκεύς, chalkeus), tailors (Greek: ράπτης, rhaptes), and cobblers (Greek: τζαγγάριος, tzangarios).

Soldiers

During the Byzantine millennium, hardly a year passed without a military campaign. Soldiers were a normal part of everyday life, much more so than in modern Western societies.. While it is difficult to draw a distinction between Roman and Byzantine soldiers from an organizational aspect, it is easier to do so in terms of their social profile. The military handbooks known as the Taktika continued a Hellenistic and Roman tradition, and contain a wealth of information about the appearance, customs, habits, and life of the soldiers..

As with the peasantry, many soldiers performed ancillary activities, like medics and technicians.. Selection for military duty was annual with yearly call-ups and great stock was placed on military exercises, during the winter months, which formed a large part of a soldier's life..

Until the 11th century, the majority of the conscripts were from rural areas, while the conscription of craftsmen and merchants is still an open question.. From then on, professional recruiting replaced conscription, and the increasing use of mercenaries in the army was ruinous for the treasury. From the 10th century onwards, there were laws connecting land ownership and military service. While the state never allotted land for obligatory service, soldiers could and did use their pay to buy landed estates, and taxes would be decreased or waived in some cases.. What the state did allocate to soldiers, however, from the 12th century onwards, were the tax revenues from some estates called pronoiai (). As in antiquity, the basic food of the soldier remained the dried biscuit bread, though its name had changed from boukelaton () to paximadion.

Teachers

Byzantine education was the product of an ancient Greek educational tradition that stretched back to the 5th century BC.. It comprised a tripartite system of education that, taking shape during the Hellenistic era, was maintained, with inevitable changes, up until the fall of Constantinople. The stages of education were the elementary school, where pupils ranged from six to ten years, secondary school, where pupils ranged from ten to sixteen, and higher education.

Elementary education was widely available throughout most of the Byzantine Empire's existence, in towns and occasionally in the countryside. This, in turn, ensured that literacy was much more widespread than in Western Europe, at least until the twelfth century. Secondary education was confined to the larger cities while higher education was the exclusive provenance of Constantinople.

Though not a society of mass literacy like modern societies, Byzantine society was a profoundly literate one.. Based on information from an extensive array of Byzantine documents from different periods (i.e. homilies, Ekloge ton nomon, etc.), Robert Browning concluded that, while books were luxury items and functional literacy (reading and writing) was widespread, but largely confined to cities and monasteries, access to elementary education was provided in most cities for much of the time and sometimes in villages.; . Nikolaos Oikonomides, focusing on 13th-century Byzantine literacy in Western Asia Minor, states that Byzantine society had "a completely literate church, an almost completely literate aristocracy, some literate horsemen, rare literate peasants and almost completely illiterate women.". Ioannis Stouraitis estimates that the percentage of the Empire's population with some degree of literacy was at most 15–20% based primarily on the mention of illiterate Byzantine tourmarchai in the Tactica of Emperor Leo VI the Wise (r. 886–912)..

In Byzantium, the elementary school teacher occupied a low social position and taught mainly from simple fairy tale books (Aesop's Fables were often used).. However, the grammarian and rhetorician, teachers responsible for the following two phases of education, were more respected. These used classical Greek texts like Homer's Iliad or Odyssey and much of their time was taken with detailed word-for-word explication. Books were rare and very expensive and likely only possessed by teachers who dictated passages to students..

Women