

A Byzantine emperor who ruled for a mere four months, his brief reign marking the chaotic end of the Heraclian dynasty's golden age.
Heraclius Constantine, often called Constantine III, was an emperor born into greatness but handed a crumbling inheritance. The eldest son of the formidable Heraclius, who had saved the empire from the Persians, he was named co-emperor as a child and groomed for power. His father's later years, however, were marred by military disaster as Arab armies erupted from the desert, seizing vast territories. When Heraclius died in 641, the empire was split between Constantine and his younger half-brother, Heraklonas, under a contentious arrangement engineered by their stepmother, Martina. Constantine III's sole reign lasted only from February to April or May of 641. Ancient sources suggest he was dying of tuberculosis even as he took power. His most significant act was a deathbed maneuver to secure his young son's succession, attempting to bypass his half-brother. His sudden death sparked immediate suspicion of poisoning, plunging the court into further intrigue and effectively ending the direct line of the dynasty his father had revitalized.
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His birth name was Heraclius, but he is called Constantine to distinguish him from his father; 'III' is a later historiographical convention.
He was the first emperor to be depicted on Byzantine coinage with a full beard, breaking from the clean-shaven Roman tradition.
The split rule with his half-brother was so unpopular that a revolt by the army forced his stepmother Martina's regency to be canceled.
Some chroniclers claim he was poisoned on orders of his stepmother, though tuberculosis is the more likely cause of death.
His son, Constans II, did eventually become sole emperor, but the dynasty never recovered its former authority.
“My father saved the empire, but left me only war and empty coffers.”