In which year did the reign of this emperor, who convoked the Second Council of Constantinople, end?
Justinian I Justinian I ( ; Latin: "Flavius Petrus Sabbatius Iustinianus Augustus" ; Greek: Φλάβιος Πέτρος Σαββάτιος Ἰουστινιανός "Flávios Pétros Sabbátios Ioustinianós" ) ( 482 14 November 565), traditionally known as Justinian the Great and also Saint Justinian the Great in the Eastern Orthodox Church, was the Byzantine (East Roman) emperor from 527 to 565. During his reign, Justinian sought to revive the empire's greatness and reconquer the lost western half of the historical Roman Empire. Justinian's rule constitutes a distinct epoch in the history of the Later Roman empire, and his reign is marked by the ambitious but only partly realized "renovatio imperii", or "restoration of the Empire".
Constantine Barbaros Constantine (Greek: Κωνσταντῖνος , surnamed Barbaros ("the barbarian", ὁ βάρβαρος ), was a Byzantine eunuch servant who rose to become "parakoimomenos" (head chamberlain) of the Byzantine emperor Leo VI the Wise in 911–912, displacing his own former master, Samonas. He held again the post during the regency of Zoe Karbonopsina in 913–919, where he played an important role in the governance of the state. He lost his post after he supported his relative Leo Phokas the Elder in his unsuccessful rivalry with Romanos I Lekapenos over control of the throne, but he was later appointed to the post of "primikerios" by Lekapenos.