Heraclius, known by the diminutive Heraclonas or Heracleonas, and sometimes called Heraclius II, was briefly Byzantine emperor in 641.
Heraclonas was the son of Heraclius and his niece Martina. Wikipedia
Born: 626 AD, Lazica
Died: 641 AD (age 15 years), Rhodes, Greece
Great-grandparent: NN
Cousin: Theodore
Grandparents: Heraclius the Elder, Epiphania, and Martinus
Uncle: Theodore