Constantine VIII Porphyrogenitus was de jure Byzantine Emperor from 962 until his death. He was the younger son of Emperor Romanos II and Empress Theophano. He was nominal co-emperor for 63 years, successively with his father; stepfather, Nikephoros II Phokas; uncle, John I Tzimiskes; and brother, Basil II.
Basil II died childless on 15 December 1025 and thus left the rule of the Byzantine Empire in Constantine's hands. Constantine had no interest in politics, statecraft or the military. His brief sole reign is said to have been "an unmitigated disaster", sparking "a collapse of the military power of the Empire". Constantine had no sons, so shortly before his death he married his daughter Zoë to his chosen successor, Romanos Argyros.