Marcian was a Byzantine Emperor who ruled from 450 to 457 AD. He is known for his military campaigns against the Persian Empire and for strengthening the Eastern Roman Empire. Marcian was also notable for his support of the Council of Chalcedon, which addressed key theological disputes within Christianity. During his reign, Marcian implemented various reforms to improve the empire's administration and finances. He worked to stabilize the economy and reduce corruption. His leadership helped to solidify the power of the Byzantine Empire during a time of external threats and internal challenges.