Constantine V Copronymus, Emperor of the East, 718-775

Constantine V (Ancient Greek: Κωνσταντῖνος, romanized: Kōnstantīnos; Latin: Constantinus; July 718 – 14 September 775) was Byzantine emperor from 741 to 775. His reign saw a consolidation of Byzantine security from external threats. As an able military leader, Constantine took advantage of civil war in the Muslim world to make limited offensives on the Arab frontier. With this eastern frontier secure, he undertook repeated campaigns against the Bulgars in the Balkans. His military activity, and policy of settling Christian populations from the Arab frontier in Thrace, made Byzantium's hold on its Balkan territories more secure. He was also responsible for important military and administrative innovations and reforms. Religious strife and controversy was a prominent feature of his reign. His fervent support of iconoclasm and opposition to monasticism led to his vilification by some contemporary commentators and the majority of later Byzantine writers, who denigrated him with the nicknames "Dung-Named" (Ancient Greek: Κοπρώνυμος, romanized: Koprónymos), because he allegedly defaecated during his baptism, similarly "Anointed with Urine" (Ancient Greek: Οὐραλύφιος, romanized: Ouralýphios), and "the Equestrian" (Ancient Greek: Καβαλλίνος, romanized: Kaballinos), referencing the excrement of horses.