Bonus (Ancient Greek: Βῶνος or Βόνος,[1] died 627) was a Byzantine statesman and general, one of the closest associates of Emperor Heraclius (r. 610–641), who played a leading role in the successful defense of the imperial capital, Constantinople, during the Avar–Persian siege of 626.
[6] By 626, Heraclius had scored several victories in the East and reversed the strategic situation in his favour, but the Persian general Shahrbaraz was still encamped with his army in western Asia Minor, close to Constantinople.
[7] Emperor Heraclius, having learned of the threat to his capital, decided not to return in person; instead, he sent advice and reinforcements to Bonus, who proceeded to strengthen the city walls and gather provisions.
Thus, on the tenth day of the siege, August 7, as the Avar assault peaked, Bonus lured the Slavs into a trap: the Byzantines had learned that the signal for the Slavic fleet to cross the strait and rendezvous with the Persian forces in Chalcedon would be the lighting of a great bonfire.
[9][11] Following this success and the repulsion of the Avars from the walls, Bonus had to restrain the over-eager people of the city, including women and children, who wanted to rush out and capture the enemy siege engines.
[14] Theophano, the first wife of Emperor Leo VI the Wise (r. 886–912), also built a church nearby, St. Constantine of the Cistern of Bonus, where her body was eventually transferred, probably after the sack of the city in 1204.