950 essay by Konstantinos VII
via Open Library
Constantine VII Porphyrogenitus in a 945 carved ivory.
De Administrando Imperio (lit. 'On imperial administration'; Greek: Πρὸς τὸν ἴδιον υἱὸν Ῥωμανόν, lit. 'to my son Romanos') is a Greek-language historiographical work written by the 10th-century Byzantine Emperor Constantine VII (945–959). It is a domestic and foreign policy manual for the use of Constantine's son and successor, the Emperor Romanos II (959–963). It is a prominent example of Byzantine encyclopaedism.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).