Annia Galeria Faustina the Younger (c. 130 AD,[1][4] – 175/176 AD)[5] was Roman empress from 161 to her death as the wife of emperor Marcus Aurelius, her maternal cousin. Faustina was the youngest child of emperor Antoninus Pius and empress Faustina the Elder. She was held in high esteem by soldiers and her husband as Augusta and Mater Castrorum ('Mother of the Camp') and was given divine honours after her death.
 
Faustina died in the winter of 175 at the military camp in Halala (a city in the Taurus Mountains in Cappadocia). The causes of her death are debated by scholars and range from death from natural causes, suicide, an accident, or even possibly assassination in retaliation for her alleged affair with Cassius earlier that year, depending on the source.
Aurelius grieved much for his wife and buried her in the Mausoleum of Hadrian in Rome. She was deified, with her statue placed in the Temple of Venus in Rome and a temple dedicated to her in her honor. Halala's name was changed to Faustinopolis and Aurelius opened charity schools for orphan girls called Puellae Faustinianae or 'Girls of Faustina'.The Baths of Faustina in Miletus are named after her.