Ardabur (consul 427) in the context of Roman–Sassanid War (421–422)

Marcian (/ˈmɑːrʃən/; Latin: Marcianus; Ancient Greek: Μαρκιανός Markianos; c. 392 – 27 January 457) was Roman emperor of the East from 450 to 457. Very little is known of his life before becoming emperor, other than that he was a domesticus (personal assistant) who served under the commanders Ardabur and his son Aspar for fifteen years. After the death of Emperor Theodosius II on 28 July 450, Marcian was made a candidate for the throne by Aspar, who held much influence because of his military power. After a month of negotiations Pulcheria, Theodosius' sister, agreed to marry Marcian. Zeno, a military leader whose influence was similar to Aspar's, may have been involved in these negotiations, as he was given the high-ranking court title of patrician upon Marcian's accession. Marcian was elected and inaugurated on 25 August 450.

Marcian reversed many of the actions of Theodosius II in the Eastern Roman Empire's relationship with the Huns under Attila and in religious matters. Marcian almost immediately revoked all treaties with Attila, ending all subsidy payments to him. In 452, while Attila was raiding Roman Italy, then a part of the Western Roman Empire, Marcian launched expeditions across the Danube into the Great Hungarian Plain, defeating the Huns in their own heartland. This action, accompanied by the famine and plague that broke out in northern Italy, allowed the Western Roman Empire to bribe Attila into retreating from the Italian peninsula.