Justin I
During the reign of Justinian I (527–565), Theodora arranged for Sophia to marry his nephew Justin. According to the Chronicon of Victor of Tunnuna, Justin was a son of Dulcidius and Vigilantia. Her father-in-law is also known as Dulcissimus in genealogical resources. Vigilantia and her brother, Justinian I, were children of Petrus Sabbatius and a senior Vigilantia, who was a sister of Justin I.