St. Marcellina was born in Gaul (what would now be Germany) circa 330. She is the sister of St. Ambrose of Milan and St. Satyrus. She moved to Rome as a young child and was raised by her older brothers. St. Marcellina became a consecrated virgin, and Pope Liberius gave her the veil on Christmas in 353. After her brother, St. Ambrose, became a bishop, she worked with him. She lived a very austere life and died in 398.