Sion (Sitten in German) in the canton of Valais (Wallis) is one of Europe’s most important prehistoric archaeological sites. The basin of the Sionne, the Rhone, the Valeria and the Tourbillon hills have been continuously inhabited since prehistoric times. At the end of the 1st century BC, Sion became the capital of the Sedunes, one of the four Celtic peoples of Valais. The other tribes were the Nantuates, Verager and Uberer.
Saint-Théodule
L’église Saint-Théodule and his life (1596), Hans Bock the Elder (1550-1624).
The Roman settlement was primarily located in the area of the present-day Church of St. Theodul and on the western side of Valeria Hill. Large Roman bathing complexes were found under the church, which have been partially excavated. By the mid-4th century, Christianity had already become the dominant religion.
St. Theodul Church and the square of the cathedral
The bishop’s seat was relocated from Martigny to Sion at the end of the 6th century, and the first cathedral was also constructed during this time. King Rudolf III (977-1032) of Burgundy’s gift of the Valais to the bishop in 999 made the episcopal city the county’s capital.
The old town, viewed from the Valeria.
The prince-bishop had jurisdiction and administered the county through fiefs and officials. The inhabitants of Sion were subject to the bishop’s Meier (maior) as judge, the Viztum (vicedominus) as administrator and the Weibel (salterus).
The decline of the feudal social order and concessions by the bishop led to the citizens of Zion becoming increasingly independent. A document from 1217 can be considered the city’s first freedom document.
De Salle du Grand Conseil, the 145th General Assembly of the Societe d’histoire de l’art en Suisse (SHAS)/Gesellschaft für Schweizerische Kunstgeschichte (GSK) in Sion on 14 June 2025
In 1338, the bishop recognised the rights of the citizens through a ‘letter of freedom’. In 1339, the Emperor of the Holy Roman Empire, Ludwig the Bavarian (1282-1347), granted the city the status of a free Reichsstadt. (imperial immediacy or Rechtsunmittelbarkeit).
The bishop could no longer ignore the increased wealth and power of citizens, as was the case in more cities of the Holy Roman Empire. Sitten was also one of the seven Zenden/Zehnden (dizains in French) of Oberwallis and, thus, a powerful political player.
Majorie Castle and the Museum of Art
In the 15th century, the episcopal town became embroiled in a power struggle between Savoy and Oberwallis, known as the Raronhandel of 1414-1418. During the Burgundian Wars (1474-1477), Savoy reconquered the city in 1475.
However, Savoy’s success was short-lived, as the Zenden of Oberwallis defeated Savoy’s troops in the same year and conquered Unterwallis. The seven Zenden then ruled the area as Untertanengebiet/territoire sujet until 1798.
The city experienced relatively peaceful times until 1798. Even the Reformation was a relatively calm period, although a large community of Protestants had emerged by the mid-sixteenth century. However, the Zenden of Oberwallis chose for the old faith in 1603.
However, the period of revolutionary France from 1789 onwards brought Wallis and Sitten to the brink of civil war. Supporters of French revolutionary ideals and representatives of the Ancien Régime were rapidly polarising.
Zinal, Val d’Anniviers, the flag of the Helvetic Republic, June 2025
Things remained unsettled after the French invasion in 1798 and Napoleon’s founding of the Helvetic Republic (1798-1803). Oberwallis even started an armed rebellion in 1799, and Sitten, as the government town of the Helvetic Republic, was even pillaged.
Napoleon intervened in 1802 and declared Valais an independent Republic (i.e., not part of the Helvetic Republic but under French control). In 1810, the appearance of independence was over, and Napoleon annexed Wallis as the new Simplon Department of the French Empire.
Allied troops ended the French era in 1813, and in 1815, Sitten became the capital of the new canton of Valais.
However, peace had not returned. Supporters of the Ancien Régime and reformists were as irreconcilably opposed as ever. The confrontation eventually led to the Battle of Triente Bridge in 1844, the Sonderbund’s affiliation, and a lost war in 1847.
The new Constitution of the canton of Valais came into force in January 1848, and the new Municipal Law in 1851. After several amendments to the Constitution after 1848, the draft of a new Constitution for the canton was rejected by the citizens of Oberwallis and Unterwallis by a large majority. Local government also underwent several changes from 1851 in line with further democratisation. Today, the majority of the city is French-speaking.
(Source and further information: gemeinde Sitten; Sitten, Historisches Lexikon der Schweiz)
The environment and nature of Sitten
The Valère and Tourbillon hills in the canton of Valais/Wallis are included in the federal inventory of landscapes of national interest (Inventaire fédéral des paysages, sites et monuments naturels/Das Bundesinventar der Landschaften und Naturdenkmäler). They offer refuge to a large number of plants and small animals, some of which are very rare.
These hills result from geological forces that formed the Alps millions of years ago and from the erosion of glaciers that, 20,000 to 15,000 years ago, covered the Rhone valley with a 1,500- to 2,000-metre-thick ice sheet.
For centuries, the dry meadows and grasslands have been the habitat of plants of Mediterranean or oriental origin adapted to the dry climate. Several rare insects, birds, small mammals and Mediterranean fauna feel at home in this environment.
The slopes of the hills are covered with steppe grassland, which is yellow and dry. They are structured by rocky outcrops of quartzite, a very ancient rock. In the valleys and on the mountain slopes, traces of centuries-old agriculture and viticulture can still be seen, irrigated by the famous suones, which draw water from the Rhone and numerous streams.
Impressions of Sion/Sitten