Editing Marcian (section)

===Foreign relations===
The Armenian king [[Vardan II Mamikonian]], who was leading a revolt against the Sassanian Empire, sent an embassy to Theodosius in 450, composed of his brother [[Hmayeak Mamikonian]], along with [[Atom Gnuni]], [[Vardan Amatuni]], and [[Meruzhan Artsruni (emissary)|Meruzhan Artsruni]], to ask for assistance. Theodosius received it favorably. Any plans were cut short by his death and the accession of Marcian.{{Sfn|Manoogian|1984|p=23}}{{Sfn|Lacey|2016|p=142}} Marcian was counseled by the diplomat [[Anatolius (consul)|Anatolius]] and {{lang|la|patricius}} [[Florentius (consul 429)|Florentius]] not to make war with the Sassanians, as it would engulf a large amount of the Eastern Roman military resources, and thus Marcian did not agree to help them.{{sfn|Jones|Martindale|Morris|1980|pp=85–86}}{{sfn|Amirav|2015|p=55 & 93}}

King [[Gubazes I of Lazica]]—a Caucasian state in theory under Eastern Roman suzerainty—was attempting to form an alliance with the Sassanians to break free of Roman control in 456.{{sfn|Mikaberidze|2015|p=346}} Marcian's troops invaded Lazica and restored Roman rule.{{sfn|Elton|2018|p=174}} In 455, Marcian banned the export to barbarian tribes of weapons and the tools used to manufacture them.{{sfn|Holmes|Singleton|Jones|2001}}