Overview
Eusebia (Greek: Εύσεβία, died 360) was the second wife of Roman emperor Constantius II. The main sources for the knowledge about her life are Julian's panegyric "Speech of Thanks to the Empress Eusebia", as well as several remarks by the historian Ammianus Marcellinus.
Family
Julian's "Panegyric In Honour Of Eusebia", the primary source for her family and ancestry, states that "she is of a family line that is pure Greek, from the purest of Greeks, and her city is the metropolis of Macedonia". Her father was reportedly the first member of the family to serve as a consul. The Panegyric never gives his name, but modern historians identify him with Flavius Eusebius, consul in 347. This Eusebius is identified elsewhere as a former Magister Equitum and Magister Peditum, which means he had served as a military commander of both the cavalry and infantry of the Roman army. The Prosopography of the Later Roman Empire considers it probable that his consulship came at the end of his military career. He is later styled "Comes".
The Panegyric mentions that Eusebia's father died some time before she married Constantius. Her mother, also unnamed in the speech, did not remarry, but "devoted herself to her children, and won a great reputation for prudence, so great indeed that whereas Penelope, while her husband was still on his travels and wanderings, was beset by those young suitors… no man however fair and tall or powerful and wealthy ever ventured to approach [Eusebia's mother] with any such proposals. And her daughter the Emperor deemed worthy to live by his side".
Ammianus Marcellinus says that Eusebia had two brothers, Eusebius and Hypatius, both of whom served as consuls. According to Ammianus, a corrupt official named Palladius accused these men of treason during the reign of Valens. Although Palladius failed to prove his case, "the accused were punished with exile and with fines; but shortly afterwards they were recalled, had their fines remitted, and were restored to their former rank and honour unimpaired."
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