 Bahram shortly invaded the domains of the Hephthalites, and recaptured Marv, killing the Hephthalite ruler, and seizing many riches.He then erected a pillar at the Amu Darya, which marked that the river constituted his empire's eastern frontier.By 427, he had fully secured his eastern section of the empire, and the inhabitants of Bukhara had started minted coins which imitated the coins of Bahram V, which implies that he had either conquered the city, or had left a strong influence there.