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- Milan, Glicerius of
- Milan, Glycerius of
- Milan, Honoratus of
- Milan, Martinian of
- Milan, Matronianus of
- Milan, Natalis of
- Milan, Protasius of
- Milan, Savina of
- Milan, Venerius of
- Milan, Veronica of
- Milan, Valeria of
- Milan, Valerie of
- Milan, Vitalis of
- Milburga
- Mildburga
- Mildgytha
- Mildred
- Milevis, Optatus of
- Milgitha
- Milles
- Miltiades
- Minervinus
- Minh, Philip
- Minias
- Miniato
- Minster-in-Thanet, Edburga of
- Minstrel Bishop
- Mirabilis, Christina
- Miranda, Portianus of
- Mirin
- Mirocles
- Mirren
- Miyako, Bonaventure of
- Miyako, Matthias of
- Mkasa, Joseph
- Mo-Sacra
- Mobeoc
- Moboac
- Mochaemhog
- Mochelloc
- Mochelloc of Kilmallock
- Mochoemoc
- Mocholmoc of Dromore
- Mocholmog of Dromore
- Mochonna
- Mochta
- Mochteus
- Mochua
- Mochua, Cronan
- Mochuda
- Mochumna
- Modan
- Modanic
- Modena, Geminian of
- Modena, Mark of
- Modena, Peregrinus of
- Moderamnus
- Moderan
- Modesta 13 Mar
- Modesta 4 Nov
- Modestus 12 Jan
- Modestus 5 Feb
- Modestus 12 Feb
- Modestus 24 Feb
- Modestus 15 Jun
- Modoald
- Modoaldus
- Modoc
- Modomnoc
- Modomnock
- Modon, Athanasius of
- Mohun, John
- Moi, Augustine
- Moissac, Amand of
- Molagga
- Molagga of Fermoy
- Molet, Pedro Martret
- Molina, Mercedes
- Molla, Gianna
- Molruan
- Momleolus
- Mommolenus
- Mommolenus
- Mommolus
- Monaldi, Buonfiglio
- Monaldo, Bonfilio
- Monan
- Monasticism, Father of Western
- Moncan
- Mond
- Monegundis
- Monessa
- Monetti, John Buonagiunta
- Monica
- Monks, Abrahamite
- Mons, Agia of
- Montaigu, Hugh of
- Montajana, John
- Montal, Paula
- Montaño, José Trinidad Rangél
- Montanol, Sebastian
- Montanus
- Monte Cassino, Felix of
- Monte Cassino, Petronax of
- Monte Marano, John of
- Monte-Mirabili, John de
- Monte Virgine, William of
- Monteagudo, Anna of the Angels
- Montechiaro, Calimerius of
- Montecorvino, Albert of
- Montegallo, Mark of
- Montegranaro, Serafino of
- Montegranaro, Serafinus of
- Montegranaro, Seraphim of
- Montegranaro, Seraphin of
- Monteluco, Isaac of
- Montepulciano, Agnes of
- Montevergine, Eustochia
- Montfort, Germanus of
- Montfort, John de
- Montfort, John of
- Monti, Aloysius Maria
- Monti, Luigi Maria
- Montmirail, John de
- Monza, Gerard of
- Monza, Luigi
- Moor, Victor the
- Mopsuetia, Auxentius of
- Mora, Miguel de la
- Morales, Manuel
- Moralez, Manuel
- Moran
- Morand
- Morano, Maddalena Caterina
- Moray, Gilbert de
- More, Hugh
- More, Thomas
- Moreau, Anne-Francoise
- Moreau, Basil Anthony Marie
- Moreau, Joseph
- Moreau, Louis-Zéphirin
- Morel, Apollinaris
- Morello, Casimiro Barello
- Moreno y Diaz, Ezekiel
- Morgan
- Moroc of Scotland
- Morón, Josefa Segovia
- Morosini, John
- Morosini, Pierina
- Morse, Henry
- Moscati, Joseph
- Moscow, Philip of
- Moscow, Sergius of
- Mosè Tovini
- Moses
- Moses of Africa
- Moses of Rome
- Moses the Black
- Moses the Ethiopian
- Moseus
- Moshnin, Prokhor
- Motalogus
- Mother Caritas
- Mother Josephine
- Mother Maria Pia
- Mother Marianne
- Mother Mary of the Cross
- Mother Saint Louis
- Mother Teresa
- Mother of New France
- Motodij Dominik Trcka
- Mottelog
- Mount Argus, Charles of
- Monte Cassino, Petronax of
- Mount Cornillon, Juliana of
- Mount Olympus, Joannicus of
- Mount Sinai, Martyrs of
- Moville, Finian of
- Moville, Finnian of
- Moÿe, Jean-Martin
- Moysetes
- Muchon, Jonas of
- Mucian
- Mucius
- Mucius the Lector
- Muensterschwarzach, Egbert of
- Muensterschwarzach, Ekbert of
- Muggaga
- Muirchu
- Muirdach MacRobartaigh
- Mukasa Kiriwawanvu
- Mukasa, Joseph
- Mullion
- Mulumba, Matiya
- Mumble
- Mumbolus
- Mummolinus
- Mummolus 8 Aug
- Mummolus 18 Nov
- Mun
- Munchin
- Munchin of Limerick
- Munchin the Wise
- Mund
- Munde
- Munden, John
- Mundus 15 Apr
- Mundus 21 Oct
- Mungo
- Munnu, Finian
- Münstethal, Trudpert of
- Mura
- Mura McFeredach
- Murames
- Muran
- Murdoch MacGroarty
- Muredach
- Muret, Stephen of
- Murialdo, Leonard
- Murrhardt, Walderic of
- Murtagh
- Musa
- Musonius
- Mustiola
- Mutien Marie Wiaux
- Muttathupadathu, Alphonsa
- Muttathupadathu, Anna
- Muzeeyi, Jean-Marie
- Muzeyi, John Maria
- My, Paul
- Mydwyn
- Mykola Carneckyj
- Mykola Cehelskyj
- Mykola Charnetsky
- Mykola Konrad
- Mykyta Budka
- Myrhhbearer, Joanna the
- Mykhailyna Hordashevska
- Myron
- Myron of Crete
- Myron the Wonder Worker
- Myrope
- Mystic of Medingen
- Mystic of the Breviary
- Mzec, John Mary
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