“The records of the central government (and it should be remembered that the Byzantine Empire was a bureaucratic state par excellence), of the provincial administration, of the Church, of secular landlords, tenants, merchants and shopkeepers have all disappeared. As a result, we have no reliable population figures, no registers of births, marriages and deaths, no trade figures, no taxation figures—practically nothing, in short, that can be counted and used for statistical purposes.” – Cyril Mango, Byzantium: The Empire of New Rome