Flavia Julia Constantia (Greek: Κωνσταντία; after 293 – c. 330) was a Roman empress as the wife of Licinius.
She was the daughter of the Roman emperor Constantius Chlorus and his wife Flavia Maximiana Theodora, and younger half-sister of Constantine the Great.
[5] Constantius already had a son, Constantine I, from his previous relationship with Helena, making him Constantia’s half-brother.
In 313, the emperor Constantine gave her in marriage to his co-emperor Licinius, on occasion of their meeting in Mediolanum.
In the following years, Constantia lived at her brother's court, receiving honours (her title was nobilissima femina).