Local feasts of the diocese are: • 5. January:
John Neumann, Redemptorist priest and fourth Bishop of Philadelphia • 4. February:
Rabanus Maurus, Frankish Benedictine monk, archbishop of Mainz • 14. February:
Valentine, 3rd-century Christian martyr • 23. February:
Willigis, Archbishop of Mainz and statesman of the
Holy Roman Empire • 27. April:
Peter Canisius, Jesuit priest who supported the Catholic faith during the Protestant Reformation in Germany • 15. May:
Rupert of Bingen, patron saint of pilgrims • 2. June:
Marcellinus and Peter, 4th-century Christian martyrs in Rome • 5. June:
Boniface, leading figure in the Anglo-Saxon mission to the German parts of the Frankish Empire. • 10. June:
Bardo of Mainz, presided over the Synod of Mainz in 1049 which denounced simony and priest marriage • 21. June:
Alban of Mainz, priest, missionary, and martyr. • 27. June:
Creszenz,
Aureus,
Theonest saints venerated by the Church of Mainz • 4. July: anniversary of the consecration of Mainz cathedral • 16. August:
Roch, Christian saint, confessor, specially invoked against the plague • 6. September: Anniversary of the consecration of churches who do not know the day of their consecration • 17. September:
Hildegard of Bingen, writer, composer, philosopher, Christian mystic, Benedictine abbess, visionary, and polymath. • 28. September:
Leoba, Anglo-Saxon nun who was part of Boniface's mission to the Germans • 16. October:
Lullus, first permanent archbishop of Mainz, succeeding Saint Boniface • 26. October:
Amandus of Straßburg, confessor, first bishop of Straßburg. • 29. October:
Ferrutius, Roman soldier, martyr in
Mogontiacum • 11. November:
Martin of Tours, soldier, later Bishop of Tours • 27. November:
Bilihildis, Frankish noblewoman, founder and abbess of the monastery of Altmünster near Mainz ==List of Bishops==