This study by the great historian J. B. Bury appeared in the journal
Byzantinische Zeitschrift (Leipzig, 1906) pp. 517-577. It is a description and analysis of the 10th-century Byzantine emperor Constantine VII Porphyrogenitus' manual known as
De Administrando Imperio. This document was written by the emperor in 948-952 for his son and heir Romanus II, as a guide to foreign and domestic policies. It describes, among many other things, the histories and characters of the nations neighboring the Empire or incorporated into it, including the Kievan Rus', Arabs, Lombards, Armenians, Georgians, Venetians, Magyars, Pechenegs, and Turks. 62 pdf pages. Book digitized by Google, article extracted and uploaded by Robert Bedrosian. Also available at Internet Archive is an English translation of
De Administrando.
John Bagnell Bury (1861-1927), a great classical scholar and author of many enduring works, was also editor of the early volumes of the Cambridge Ancient History.