Gratianus

Gratianus' father was Theodosius The Great and his mother was Aelia Flacilla.  His paternal grandparents were Theodosius The Elder and Thermantia; his maternal grandparents were Theodosius The Elder and Thermantia. He had two brothers and a sister, named Arcadius, Honorius and Pulcheria. He had a half-sister named Galla Placidia.