From reign of Constantine VII and Romanus II.
About the first, in Enc. Britt.: born September 905, Constantinople [now Istanbul, Tur.] died Nov. 9, 959. Also called Constantine Vii Flavius Porphyrogenitus Byzantine emperor from 913 to 959. His writings are one of the best sources of information on the Byzantine Empire and neighbouring areas. His De administrando imperio treated the Slavic and Turkic peoples, and the De ceremoniis aulae Byzantinae, his longest book, described the elaborate ceremonies that made the Byzantine emperors priestly symbols of the state.
About Romanus: Byzantine emperor from 959 to 963. The son of Constantine VII Porphyrogenitus, Romanus was a politically incapable ruler who left affairs of state to the eunuch Joseph Bringas and military affairs to Nicephorus Phocas; Nicephorus became emperor after Romanus' death with the help of Romanus' widow, Theophano.