Saint Marcellina († 397) was born in Trier, Gaul the daughter of the Praetorian prefect of Gaul, and older sister of Saint Ambrose of Milan, who devoted her life to prayer and asceticism. After Ambrose had become Bishop of Milan in 374, he summoned his sister, and found in her a zealous assistant in fostering and extending the ascetic life among the maidens of Milan. Marcellina survived her brother by a year, dying in 398. Honored as a saint, she was buried in the crypt under the altar of the Ambrosian Basilica in Milan. Her feast day is celebrated on July 17th.