Annia Galeria Faustina, also known as Faustina the Younger, was the daughter of Antoninus Pius and Faustina the Elder, as well as great-niece to Hadrian. For a time she was engaged to Lucius Verus, however when the father of Antoninus Pius died, Hadrian, the reigning emperor, adopted him as his son and he eventually became Hadrian's successor. Faustina's father ended the engagement between his daughter and Verus and then arranged her betrothal to her maternal cousin Marcus Aurelius. When Antoninus Pius died in March 161AD, her husband and Lucius Verus succeeded her father's throne and ruled the empire as co-ruler Roman Emperors.
Contemporary literature was not kind to Faustina and represented her as a scurrilous personality recalling stories of her adulterous encounters with sailors and gladiators and going as far as to suggest that her son Commodus was the son of one such union.