Saint Aurelius Ambrosius (†397), better known in English as Ambrose, was a bishop of Milan who became one of the most influential ecclesiastical figures of the 4th century. Ambrose was a staunch opponent of Arianism, and has been accused of fostering persecutions of Arians, Jews, and pagans. Traditionally, Ambrose is credited with promoting "antiphonal chant", a style of chanting in which one side of the choir responds alternately to the other, as well as with composing Veni redemptor gentium, an Advent hymn. Ambrose was one of the four original Doctors of the Church, and is the patron saint of Milan. His feast day is celebrated on December 7 and he is a patron saint of Bee keepers; bees; bishops; candle makers; domestic animals; French Commissariat; geese; learning; livestock; Milan; police officers; students; and wax refiners.
Saint Marcellina († 397) was born in Trier, Gaul the daughter of the Praetorian prefect of Gaul, and older sister of Saint Ambrose of Milan. She devoted her life to the practice of prayer and asceticism. Her feast day is celebrated on July 17th.
Saints Gervasius and Protasius are venerated as Christian martyrs, probably of the 2nd century. They are the patron saints of Milan and of haymakers and are invoked for the discovery of thieves. Their feast day in the Latin Rite of the Catholic Church is 19 June, the day marking the translation of their relics. In the Eastern Orthodox Church and in the Eastern Rites of the Catholic Church, their feast takes place on 14 October (O.S.)/24 October (N.S.), the traditional day of their death.