# List of bishops of Sion

List of bishops of the Roman Catholic Diocese of Sion:

## Late Antiquity
### Bishops of Agaunum (Octodurum)

| From | To | Bishop |
| fl. 380s | | Theodore |
| fl. 440 | | Salvius/Silvius |
| fl. 490 | | Prothais |
| | 516(?) | Theodore II(?) |
| 517 | | Constantinus |
| 549 | | Rufus |
| 565 | | Agricola |

## Early Middle Ages

| From | To | Bishop | Notes |
| 585 | | Heliodorus | |
| 613 | 614 | Leudemond | |
| 647 | 653 | Prothais | |
| 673 | 690 | Saint Aimé | |
| 762 | 765 | Willicar | |
| 786/8 | 796/8 | Altheus | |
| fl. 805 | | Theodore III(?) | According to 12th-century legend, secular power was granted to the bishops of Sion by Charlemagne |
| fl. 824 | | Adalongus | |
| 825 | 857 | Heyminus | |
| 877 | 899/900 | Waltherius | |
| 932 | | Asmundus | |
| fl. 940 | | Manfredus (?) | |
| 983 | 984/5 | Amizo | |

## Prince-bishops of Sion
### Middle Ages

| From | To | Bishop | Notes |
| 993/4 | 1018/20 | Hugues | First prince-bishop, granted secular power by Rudolph III of Burgundy in c. 999 |
| 1034 | 1053/4 | Aymon of Savoy | Succeeded his brother Buchardus as Abbot of St Maurice in 1049 or 1050 |
| 1054 | 1087-1090 | Ermenfroi | |
| fl. 1092 | | Gausbertus | |
| 1107 | 1116 | Vilencus | |
| 1135 | 1138 | Boson | |
| 1138 | 1150 | Saint Guérin | |
| 1150 | 1162(?) | Louis | |
| 1162 | 1168 (?) | Amédée of La Tour | |
| 1176 | 1177 | Guillaume of Blonay | |
| 1179 | 1181 or 1184 | Conon | |
| 1184(?) | 1196 | Guillaume of Candie | |
| 1196 | 1203 | Nantelme of Écublens | |
| 1203 | 1205 | Guillaume of Saillon | |
| 1206 | 1237 | Landry of Mont | |
| 1237 | 1243 | Boson II of Granges | |
| 1243 | 1271 | Henri of Rarogne | |
| 1271 | 1273 | Rodolphe of Valpelline | |
| 1273 | 1287 | Pierre of Oron | |
| February 1287 | 15 December 1289 | | vacant |
| 1289 | 1308 | Boniface of Challant | |
| 1308 | 1323 | Aymon of Châtillon | |
| 1323 | 1338 | Aymon of La Tour | |
| 1338 | 1342 | Philippe of Chamberlhac | |
| 1342 | 1375 | Guichard Tavelli | Murdered by defenestration |
| 1375 | 1386 | Édouard of Savoy | |

### Western Schism
#### loyal to Avignon

| From | To | Bishop |
| 1386 | 1386 | Guillaume of La Baume-Saint-Amourb |
| 1387 | 1387 | Robert Chambrier |
| 1388 | 1392 | Humbert de Billens |
| 1398 | 1404 | Aymon Séchala |
| 1404 | 1417 | Jacques (Antoine?) de Challant |

#### loyal to Rome

| From | To | Bishop | Notes |
| 1387 | 1388 | Gerardus (Girard Tavel?) | |
| 1392 | 1393 | Henri de Blanchis | |
| 1394 | 1402 | Guillaume IV ("the Good") of Rarogne | |
| 1402 | 1418 | Guillaume V of Rarogne | see Raron affair |

### Renaissance to early modern

| From | To | Bishop | Notes |
| 1418 | 1437 | André dei Benzi of Gualdo | Archbishop of Kolocza (in Hungary); administrator from 1418, bishop from 1431. Valais witch trials. |
| 1437 | 1451 | Guillaume VI of Rarogne | |
| 1451 | 1457 | Henri Asperlin | |
| 1457 | 1482 | Walter Supersaxo | Burgundian War |
| 1482 | 1496 | Jost of Silenen (d. 1498) | Member of Lucerne nobility (uncle of Kaspar von Silenen) and diplomat for the Swiss Confederacy, bishop of Grenoble 1477–1467, Jost ruled as a "Renaissance prince" but after failed campaigns against Milan was forced to abdicate and went into exile in Lyon, retaining only the title of titular bishop of Hierapolis. |
| 1496 | 1499 | Nicolas Schiner | |
| 1499 | 1522 | Mathieu Schiner | Cardinal; nephew of Nicolas Schiner |
| 1522 | 1528 | Philippe am Hengart (not recognised by the Pope) Philippe de Platea (not recognised locally) | |
| 1529 | 1545 | Adrien I of Riedmatten | Valais becomes an eternal associate of the Old Swiss Confederacy in 1529. |
| 1548 | 1565 | Jean Jordan | |
| 1565 | 1604 | Hildebrand I of Riedmatten | Banned protestantism in 1604 |
| 1604 | 1613 | Adrien II of Riedmatten | |
| 1613 | 1638 | Hildebrand II Jost | In 1628, the Valais becomes a republic, but remains under the nominal rule of the prince-bishops. |
| 1638 | 1640 | Barthélemy Supersaxo | |
| 1640 | 1646 | Adrien III of Riedmatten | |
| 1646 | 1672 | Adrien IV of Riedmatten | |
| 1672 | 1701 | Adrien V of Riedmatten | |
| 1701 | 1734 | François-Joseph Supersaxo | |
| 1734 | 1752 | Jean-Joseph-Arnold Blatter | |
| 1752 | 1760 | Jean-Hildebrand Roten | |
| 1760 | 1780 | François-Joseph-Frédéric Ambuel | |
| 1780 | 1790 | François-Melchior-Joseph Zen-Ruffinen | |
| 1790 | 1807 | Joseph Anton Blatter | Last prince-bishop, loss of secular power with the French invasion of 1798. |

## Modern history

| From | To | Bishop | Notes |
| 1807 | 1817 | Joseph-François-Xavier de Preux | |
| 1817 | 1829 | Auguste-Sulpice Zen-Ruffinen | |
| 1830 | 1843 | Maurice-Fabien Roten | |
| 1843 | 1875 | Pierre-Joseph de Preux | |
| 1875 | 1901 | Adrien VI Jardinier | |
| 1901 | 11 July 1918 | Jules-Maurice Abbet | Born 11 September 1845 |
| 1919 | 19 March 1952 | Victor Bieler | Born 16 March 1881 |
| 1952 | 1975 | François-Nestor Adam | Born 7 February 1903; died 8 February 1990 |
| 1975 | 1995 | Henri Schwery | Born 14 June 1932 |
| 1995 | 2014 | Norbert Brunner | Born 21 June 1942 |
| 2014 | | Jean-Marie Lovey | Born 2 August 1950 |