John VI Kantakouzenos dating history

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John VI Kantakouzenos, Cantacuzenus, or Cantacuzene (Greek: Ἰωάννης Ἄγγελος Παλαιολόγος Καντακουζηνός, Iōánnēs Ángelos Palaiológos Kantakouzēnós; Latin: Johannes Cantacuzenus; c. – 15 June 1383) was a Greek nobleman, statesman, and general. He served as grand domestic under Andronikos III Palaiologos and regent for John V Palaiologos before reigning as Byzantine emperor in his own right from 1347 to 1354. Deposed by his former ward, he was made to retire to a monastery under the name
and spent the remainder of his life as a monk and historian. At age 90 or 91 at his death, he was the most aged of the Roman emperors.