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At what age did Hannibal become commander of the Carthaginian army in Spain?

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Illustration of Hannibal the Carthaginian general wearing a metal helmet and armor, holding a shield decorated with a horse. — Hannibal Hannibal, engraving by John Chapman, 1800.

Following the assassination of his brother-in-law Hasdrubal in 221 BCE, Hannibal was proclaimed commander in chief of the Carthaginian army in Spain at the age of 26. The Carthaginian government subsequently ratified this field appointment.1