| Bishops |
  Bishop Paul McAleenan (73)
Titular Bishop of Mercia
Auxiliary Bishop of Westminster (England)
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 Bishop John Edgar McCafferty
| Born: | 1920.01.06 (USA) | | Ordained Priest: | 1945.03.17 | | Consecrated Bishop: | 1968.06.14 | | Died: | 1980.04.30 († 60) |
| Titular Bishop of Tanudaia (1968.01.05 – 1980.04.30) Auxiliary Bishop of Rochester (USA) (1968.01.05 – 1980.04.30) |
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 Bishop James Francis McCarthy (82)
Titular Bishop of Verrona
Auxiliary Bishop emeritus of New York (USA)
Evangelium gratiæ Dei | Born: | 1942.07.09 (Mount Kisco, NY, USA) | | Ordained Priest: | 1968.06.01 | | Consecrated Bishop: | 1999.06.29 |
| Priest of New York (USA) (1968.06.01 – 1999.05.11) Auxiliary Bishop of New York (USA) (1999.05.11 – 2002.06.15) Titular Bishop of Verrona (1999.05.11 – ...) |
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 Archbishop Francis McCormack
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Bishop William Jerome McCormack Christ must increase | Born: | 1924.01.24 (New York, NY, USA) | | Ordained Priest: | 1959.02.21 | | Consecrated Bishop: | 1987.01.06 | | Died: | 2013.11.23 († 89) |
| Auxiliary Bishop of New York (USA) (1986.12.23 – 2001.10.30) Titular Bishop of Nicives (1986.12.23 – 2013.11.23) |
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Bishop Patrick Joseph McCormick Sub tuum præsidium | Born: | 1880.12.10 (USA) | | Ordained Priest: | 1904.07.26 | | Consecrated Bishop: | 1950.09.21 | | Died: | 1953.05.18 († 72) |
| Titular Bishop of Atenia (1950.06.14 – 1953.05.18) Auxiliary Bishop of Washington (USA) (1950.06.14 – 1953.05.18) |
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Bishop Gerald Vincent McDevitt | Born: | 1917.02.23 (USA) | | Ordained Priest: | 1942.05.30 | | Consecrated Bishop: | 1962.08.01 | | Died: | 1980.09.29 († 63) |
| Titular Bishop of Tigias (1962.06.22 – 1980.09.29) Auxiliary Bishop of Philadelphia (USA) (1962.06.22 – 1980.09.29) |
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Bishop William Joseph McDonald | Born: | 1904.06.17 (Ireland) | | Ordained Priest: | 1928.06.10 | | Consecrated Bishop: | 1964.05.19 | | Died: | 1989.01.07 († 84) |
| Auxiliary Bishop of Washington (USA) (1964.03.17 – 1967.07.26) Titular Bishop of Aquæ regiæ (1964.03.17 – 1989.01.07) Auxiliary Bishop of San Francisco (USA) (1967.07.26 – 1979.06.05) |
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Bishop Charles James McDonnell | Born: | 1928.07.07 (Queens, NY, USA) | | Ordained Priest: | 1954.05.29 | | Consecrated Bishop: | 1994.05.12 | | Died: | 2020.02.13 (Newark, NJ, USA † 91) |
| Auxiliary Bishop of Newark (USA) (1994.03.15 – 2004.05.21) Titular Bishop of Pocofeltus (1994.03.15 – 2020.02.13) |
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Bishop Thomas John McDonnell Ad Jesum per Mariam | Born: | 1894.08.18 (USA) | | Ordained Priest: | 1919.09.20 | | Consecrated Bishop: | 1947.09.15 | | Died: | 1961.02.25 († 66) |
| Auxiliary Bishop of New York (USA) (1947.07.02 – 1951.03.15) Titular Bishop of Sela (1947.07.02 – 1961.02.25) Coadjutor Bishop of Wheeling (USA) (1951.03.15 – 1961.02.25) |
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Bishop John Bernard McDowell | Born: | 1921.07.17 (New Castle, PA, USA) | | Ordained Priest: | 1945.11.04 | | Consecrated Bishop: | 1966.09.08 | | Died: | 2010.02.25 († 88) |
| Auxiliary Bishop of Pittsburgh (USA) (1966.07.19 – 1996.09.09) Titular Bishop of Tamazuca (1966.07.19 – 2010.02.25) |
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Archbishop Bryan Joseph McEntegart Estote factores verbi | Born: | 1893.01.05 (New York, NY, USA) | | Ordained Priest: | 1917.09.08 | | Consecrated Bishop: | 1943.08.03 | | Died: | 1968.09.30 († 75) |
| Bishop of Ogdensburg (USA) (1943.06.05 – 1953.08.19) Titular Bishop of Aradi (1953.08.19 – 1957.04.16) Bishop of Brooklyn (USA) (1957.04.16 – 1968.07.15) Archbishop ad personam (1966.04.15 – 1968.07.15) Titular Archbishop of Gabi (1968.07.15 – 1968.09.30) |
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Archbishop Joseph Francis McGeough |
Bishop David Christopher McGough | Born: | 1944.11.20 (Tunstall, Staffordshire, England) | | Ordained Priest: | 1970.03.14 | | Consecrated Bishop: | 2005.12.08 | | Died: | 2023.03.26 (Tean, Staffordshire, England † 78) |
| Priest of Birmingham (England) (1970.03.14 – 2005.10.25) Auxiliary Bishop of Birmingham (England) (2005.10.25 – 2020.03.18) Titular Bishop of Chunavia (2005.10.25 – 2023.03.26) |
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 Bishop Henry Mchamungu (59)
Titular Bishop of Tanaramusa
Auxiliary Bishop of Dar-es-Salaam (Tanzania)
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Bishop John Joseph McIntyre (61) Titular Bishop of Bononia
Auxiliary Bishop of Philadelphia (USA)
Spe gaudentes | Born: | 1963.08.20 (Philadelphia, PA, USA) | | Ordained Priest: | 1992.05.16 | | Consecrated Bishop: | 2010.08.06 |
| Priest of Philadelphia (USA) (1992.05.16 – 2010.06.08) Titular Bishop of Bononia (2010.06.08 – ...) Auxiliary Bishop of Philadelphia (USA) (2010.06.08 – ...) |
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Bishop Joseph Crescent McKinney As one who serves | Born: | 1928.09.10 (Grand Rapids, MI, USA) | | Ordained Priest: | 1953.12.20 | | Consecrated Bishop: | 1968.09.26 | | Died: | 2010.06.09 († 81) |
| Auxiliary Bishop of Grand Rapids (USA) (1968.07.24 – 2001.10.03) Titular Bishop of Lentini (1968.07.24 – 2010.06.09) |
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 Archbishop Colin Francis McKinnon
Sub cruce salus | Born: | 1811.07.29 (Canada) | | Ordained Priest: | 1837.01.01 | | Consecrated Bishop: | 1852.02.27 | | Died: | 1879.09.26 († 68) |
| Bishop of Arichat (Canada) (1851.09.21 – 1877.08.30) Titular Archbishop of Amida (1877.08.30 – 1879.09.26) |
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Bishop Bernard Joseph McLaughlin Live the truth in love | Born: | 1912.11.19 (Buffalo, NY, USA) | | Ordained Priest: | 1935.12.21 | | Consecrated Bishop: | 1969.01.06 | | Died: | 2015.01.05 († 102) |
| Auxiliary Bishop of Buffalo (USA) (1968.12.28 – 1988.01.05) Titular Bishop of Mottola (1968.12.28 – 2015.01.05) |
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Bishop Edward Peter McManaman Christo servire | Born: | 1900.05.03 (USA) | | Ordained Priest: | 1927.03.12 | | Consecrated Bishop: | 1948.10.28 | | Died: | 1964.07.18 († 64) |
| Titular Bishop of Floriana (1948.07.24 – 1964.07.18) Auxiliary Bishop of Erie (USA) (1948.07.24 – 1964.07.18) |
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Bishop John Michael McNamara Sentire cum Christo | Born: | 1878.08.12 (USA) | | Ordained Priest: | 1902.06.21 | | Consecrated Bishop: | 1928.03.29 | | Died: | 1960.11.26 († 82) |
| Auxiliary Bishop of Baltimore–Washington (USA) (1927.12.16 – 1947.11.15) Titular Bishop of Eumenia (1927.12.16 – 1960.11.26) Auxiliary Bishop of Washington (USA) (1947.11.15 – 1960.11.26) |
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Bishop John Richard McNamara To echo Christ | Born: | 1927.09.04 (USA) | | Ordained Priest: | 1952.01.10 | | Consecrated Bishop: | 1992.05.21 | | Died: | 2001.04.16 († 73) |
| Auxiliary Bishop of Boston (USA) (1992.04.14 – 1999.10.12) Titular Bishop of Risinium (1992.04.14 – 2001.04.16) |
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 Archbishop Hugh McSherry
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 Bishop Michael Mdzewski
| Born: | 1744.09 | | Ordained Priest: | 1768.06.24 | | Died: | 1814 († 70) |
| Titular Bishop of Delcus (1791.12.19 – 1814) Auxiliary Bishop of Płock (Poland) (1791.12.19 – 1814) |
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Bishop Stefan Antonin Mdzewski, O.P. | Born: | 1653 | | Consecrated Bishop: | 1690.03.12 | | Died: | 1718.05.16 († 64) |
| Auxiliary Bishop of Luck (Ukraine) (1690.01.11 – 1699.08.13) Titular Bishop of Calama (1690.01.11 – 1718.05.16) Auxiliary Bishop of Gniezno (Poland) (1699.08.13 – 1718.05.16) |
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