"John I Tzimiskes (Greek: Ἰωάννης ὁ Τζιμισκής, romanized: Iōánnēs ho Tzimiskēs; c. 925 – 10 January 976) was the senior Byzantine Emperor from 11 December 969 to 10 January 976. ...
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An intuitive and successful general, he strengthened the Empire and expanded its borders during his short reign." - (en.wikipedia.org 11.08.2021)