Aelia Flavia Flaccilla (31 March 356 - 386), was a Roman empress and first wife of the Roman Emperor Theodosius I. She was of Hispanian Roman descent. During her marriage to Theodosius, she gave birth to two sons — future Emperors Arcadius and Honorius — and a daughter, Aelia Pulcheria. She was titled Augusta, as her coinage shows.