Justina was a daughter of Justus, governor of Picenum under Constantius II. According to Socrates of Constantinople: "Justus the father of Justina, who had been governor of Picenum under the reign of Constantius, had a dream in which he seemed to himself to bring forth the imperial purple out of his right side. When this dream had been told to many persons, it at length came to the knowledge of Constantius, who conjecturing it to be a presage that a descendant of Justus would become emperor, caused him to be assassinated."