Giustina was born in Picenum, Italy to Giusto, the governor of the city under the emperor Constantius II. She was famously beautiful and ambitious, marrying the usurper Magnus Magnentius, a commander of the Ioviani and Herculiani. After his suicide in 353 AD, Giustina became the second wife of emperor Valentinian I, a man of complex personality and great military prowess. According to legend, Valentinian’s first wife, Marina Severa, was the one who, being struck by Giustina’s beauty, presented her to the emperor. She gave Valentinian a son, Valentinian II, and became the stepmother of the emperor’s first son Gratian. During Gratian’s reign, Giustina lived in Sirmium, Pannonia. As most Roman empresses, she wore elaborate jewels, sported eccentric hairstyles and long, rich earrings. When her son Valentinian II came to power at the age of four, Giustina ruled in his name, showing the full extent of her ambition and strong personality. Being a fervent Arian Christian, Giustina ferociously opposed the powerful and influential bishop of Milan, Ambrose who was a Nicean Christian. Giustina died in 387 AD while traveling. Lacking her protection, her son Valentinian II was assassinated soon after. Giustina demonstrated an impressive personality, able to control the political scene at court even when the odds were stacked against her. With her legendary beauty, she enchanted the late Roman courtiers while also dominating them with her iron personality.