De Administrando Imperio
In the beginning of the "De Administrando Imperio", Constantine VII wrote that the work was a set of knowledge which his son Romanos II (born in 938, and ruled 959-963) will need. The intention of Emperor Constantine VII to write a manual for his successor, Romanos II, reduces the possibility that large untruths have been written. Therefore, De Administrando Imperio is one of the most important sources for the study of the Eastern Roman Empire (Byzantium) and its neighbors.