Ioannes V Palaiologos & Helena Kantakuzena 
They had a son named Manuel II.
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Personal Details
Ioannes V Palaiologos
Ioannes V was born on June 18th, 1332. He died at the age of 58 on February 5th, 1391.
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Children
Manuel II Palaiologos
Manuel II was born on June 27th, 1350. He died at the age of 75 on July 21st, 1425.