"John V Palaiologos or Palaeologus (Greek: Ίωάννης Ε´ Παλαιολόγος, Iōannēs V Palaiologos; 18 June 1332 – 16 February 1391) was a Byzantine emperor, who succeeded his father ...
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in 1341 at the age of eight." - (en.wikipedia.org 12.12.2019)