Martinian (emperor)

Lore & Background

Due to the intervention of Flavia Julia Constantia, Constantine's sister and Licinius' wife, both Licinius and Martinian were initially spared—Licinius imprisoned in Thessalonica, Martinian in Cappadocia. However, Constantine soon regretted his leniency, and both former emperors were subsequently executed. Martinian was probably executed in the spring of 325 in Cappadocia.

Reader's Guide

Martinian's significance lies in his role as a short-lived co-emperor during the final phase of the civil wars that consolidated Constantine I's sole rule over the Roman Empire. His elevation by Licinius mirrored an earlier appointment of Valens, highlighting Licinius' need for a loyal deputy to counter Constantine's son Crispus. Martinian's military assignment at Lampsacus and the subsequent naval defeat illustrate the strategic challenges Licinius faced. His execution, despite initial clemency, underscores Constantine's pragmatic ruthlessness in eliminating rivals. The uncertainty surrounding Martinian's full name and the abbreviated coin legends reflect the ephemeral nature of his reign and the limited historical record. His legacy is primarily as a footnote in the transition from the Tetrarchy to Constantine's sole emperorship.

Did You Know?

• Martinian's full name is unattested; his coins show only an abbreviated form, with 'Mar' possibly standing for 'Marcius' or 'Martinus'.
• He was appointed co-emperor by Licinius after the Battle of Adrianople in 324, to replace Constantine (in name only) as western Augustus.
• Martinian was sent to Lampsacus with Visigothic auxiliaries to block Constantine's crossing of the Hellespont, but a naval battle destroyed Licinius' fleet.
• He was initially spared due to the intervention of Flavia Julia Constantia, Constantine's sister, but was later executed in Cappadocia in spring 325.