List of bishops of the Roman Catholic Diocese of Sion :
Late Antiquity Bishops of Agaunum (Octodurum) From To Bishop Notes 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 Notes 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 Coat of arms of Hildebrand of Riedmatten (1594). The prince-bishops used their family coats of arms; the Riedmatten coat of arms was in use for much of the early modern period (1529–1545, 1565–1613, 1640–1701) and is presented as coat of arms of the bishopric in e.g. Siebmacher (1605) . 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[ 1] 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 Modern coat of arms 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
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