The new Emperor needed the support of both the civil institutions, the Roman senate and the Eastern Roman Emperor Marcian, as well as that of the army and its commanders (the generals Majorian and Ricimer) and the Vandals of Gaiseric.
Leo had pressed for it to take place in Italy, but Emperor Marcian instead called for it to convene at Nicaea.
Candidus places the banishment of Verina before the revolt of Marcian, and Theodore Lector assigns as the cause of it her share in the revolt of Basiliscus.
The bulk of this new Institutes is the Institutes of Gaius, much of it taken verbatim; but it also uses material from the Institutes of Marcian, Florentinus, Ulpian, and perhaps Paulus (the other writers of "authority.".
Marcian, was summoned to the First Council of Constantinople of Constantinople in 381, but refused to retract his adherence of the Macedonian Christian sect.
Browning's friend and fellow poet Bryan Procter acknowledged basing his 1820 "Marcian Colonna" on this source, but added a new detail; after the murder, the killer sits up all night with his victim.
The Second Council of Ephesus upheld the view of Eutyches, but was overturned two years later by the Council of Chalcedon, called by Emperor Marcian.
A narrative known as the Euthymiaca Historia (written probably by Cyril of Scythopolis in the 5th century) relates how the Emperor Marcian and his wife, Pulcheria, requested the relics of the Virgin Mary from Juvenal, the Patriarch of Jerusalem, while he was attending the Council of Chalcedon (451).
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A small upper church on an octagonal footing was built by Patriarch Juvenal (during Marcian's rule) over the location in the 5th century, and was destroyed in the Persian invasion of 614.