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Constantine VIII became the sole Byzantine emperor, 63 years after being crowned co-emperor.

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Constantine VIII
Byzantine emperor from 962 to 1028
Constantine VIII 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 from 962, successively with his father; stepfather, Nikephoros II Phokas; uncle, John I Tzimiskes; and brother,…Source: Wikipedia (CC BY-SA)
Byzantine Empire
Continuation of the Roman Empire (330–1453)
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman Empire in the 5th century AD, it…Source: Wikipedia (CC BY-SA)