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John's namesake grandfather had been a commander of the elite Hikanatoi regiment (tagma) under Emperor Basil I (reigned 867–886); John's brother Theophilos became a senior general, as did John's own son, Romanos, and his great-nephew, John Tzimiskes.
While in Constantinople he wrote a history covering the reigns of Romanus II, Nicepheros II, John Tzimiskes, and the early part of the reign of Basil II.