Emperor Marcian was a Byzantine emperor who ruled from 450 to 457 AD. He is best known for his efforts to strengthen the empire and for his role in the Council of Chalcedon, which addressed important theological disputes within Christianity. Marcian was a military leader and worked to secure the empire's borders against various threats. During his reign, Marcian focused on reforming the military and improving the administration of the empire. He also sought to reduce the influence of the Huns and other barbarian groups. His leadership helped stabilize the Byzantine Empire during a challenging period in its history.