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Herodianus, the son of Odaenathus, was crowned co-king by his father in 263 AD. He shared the throne with his brother, Vabalathus, and ruled Palmyra and its territories alongside their father until Odaenathus' assassination in 267 AD. Herodianus and Vabalathus assumed full control of the kingdom after Odaenathus' death and continued the Palmyrene Empire's expansion and influence in the region.