History

• 1857.01.09: Established as Diocese of Alton (English) / Altonen(sis) (Latin) (from the suppressed Diocese of Quincy)
• 1887.01.07: Lost territory to establish Diocese of Belleville
• 1923.10.26: Suppressed (to establish Diocese of Springfield in Illinois)
• 1995: Restored as Titular Episcopal See of Alton (English) / Altonen(sis) (Latin)

Titular Bishop Titular Bishop (2001.10.30 – ...): Bishop Josu Iriondo (82) Auxiliary Bishop emeritus of New York (USA) Past Ordinaries Bishops of Alton (Roman Rite) Bishop James Ryan (1888.02.28 – 1923.07.02) Born: 1848.06.17 (USA) Ordained Priest: 1871.12.24 Consecrated Bishop: 1888.05.01 Died: 1923.07.02 († 75) Bishop of Alton (1888.02.28 – 1923.07.02) Bishop Peter Joseph Baltes (1869.09.24 – 1886.02.15) Born: 1827.04.07 (USA) Ordained Priest: 1853.05.21 Consecrated Bishop: 1870.01.23 Died: 1886.02.15 († 58) Bishop of Alton (1869.09.24 – 1886.02.15) Bishop Henry Damian Juncker (1857.01.09 – 1868.10.02) Born: 1809.08.22 (USA) Ordained Priest: 1834.03.16 Consecrated Bishop: 1857.04.28 Died: 1868.10.02 († 59) Bishop of Alton (1857.01.09 – 1868.10.02)

Former Titular Bishops

• Titular Bishop:  Bishop John Clayton Nienstedt (73) (later Archbishop) (1996.06.12 – 2001.06.12)

as of 2020.12.31

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