Upon marrying Hannibalianus her father allegedly made her
Augusta. However, this claim is preserved only by
Philostorgius among ancient sources and has been debated. After her husband was executed in AD 337, Constantina disappeared from the imperial record until AD 350. This was when
Magnentius revolted against her brother Constantius II causing political upheaval in the Western parts of the empire. This prompted her to become directly involved in the revolt. Using her Augusta status and political network, she claimed
Vetranio as Caesar, encouraging him to challenge Magnentius. This allowed her to protect her own interests and preserve her power. But Constantius II refused this offer. Shortly after, in AD 351, Constantius II used Constantina for a different political purpose and gave her in marriage to Constantius Gallus who was made
Caesar in the Eastern Roman Empire and they moved to Antioch. but it may have had at least as much to do with Constantina who, besides having known power as Constantine's daughter and Hannibalianus' wife, had prompted the opposition of
Vetranio to
Magnentius, and whose hand had been sought from Constantius by ambassadors of Magnentius himself. The marriage, besides benefiting Constantius, extricated her from a dangerous situation in the empire and placed her in a position from which she might control the younger and inexperienced
Caesar, an interest she shared with Constantius. On the other hand, it is possible that Constantius saw the marriage as a way to remove his intrusive – perhaps treasonous – sister from the volatile west. If the mention in the
Passio Artemii (11) of letters from Constantina to her brother preserves a genuine tradition, it is possible Constantina even initiated the proposal that she marry Gallus. Gallus ruled over the East from
Antioch, and his purpose was to keep under control the
Sassanid menace. Gallus, however, alienated the support of his subjects with his arbitrary and merciless rule. Constantina supported her husband. It is in Antioch that Constantina appeared to become politically active in the way of imperial Roman women. According to
Ammianus Marcellinus, she largely operated hidden from the public view but was still sinister, brutal and controlling. He suggests that she called for the murder of several people: during an interrogation about people killed on his orders, "Gallus...had just enough strength to reply that most of them had been massacred at the insistence of his wife Constantina". She accepted a necklace as a bribe for securing the execution of a nobleman. In ancient historical sources, she was generally perceived as a cruel and violent but politically dynamic figure. When, after receiving the complaints of the Anthiocheans, Constantius II summoned both Gallus and Constantina, but according to Ammianus Constantina, in her last attempt at using her political power, journeyed ahead to meet with her brother the emperor to try to pacify him in his conflict with her husband Constantius Gallus, during which she died from illness. ==Character assessment==