After the death of her husband at the Battle of Adrianople, she ruled as de facto regent and defended Constantinople against the attacking Goths until his successor Theodosius I arrived.
[8][9] The names Anastasia, Domnicus, Eusebius, Petronius and Procopius used by various family members are thought to be Greek in origin.
Various scholars have suggested this could indicate the descent of Domnica and her relatives from Greek-speaking families of Sirmium, the initial capital of the Praetorian prefecture of Illyricum.
Marriage into a Greek family could have helped solidify Valens' rule over the Hellenized Eastern Roman Empire.
[10] She married Valens prior to his accession as emperor and had two daughters, Anastasia and Carosa, as well as a son, Valentinianus Galates.
The First Council of Nicaea in 325 had established the Nicene Creed, which declared that the Father, Son, and Holy Spirit were all equal to each other and of the same substance.
The theologian Arius, founder of Arianism, disagreed with this and believed that the three parts of the Trinity were materially separate from each other and that the Father created the Son.
When asked to pray for the child, known as Galates, Basil is said to have responded by giving Valens’ commitment to orthodoxy as the condition for the boy's survival.