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| YEAR | DATE | EVENT | HEAD OF STATE |
| 999 | the prince-bishop of Sion becomes Comte du Valais | ||
| 1529 | 12 march | associated member of Switzerland | |
| 1672 | 25 august | prince-bishops Adrien V de Riedmatten | |
| 1701 | 2 june | prince-bishops Franz Joseph Supersaxo | |
| 1734 | 18 may | prince-bishops Johann Joseph Arnold Blatter | |
| 1752 | 31 august | prince-bishops Johann Hildebrand von Roten | |
| 1760 | 18 december | prince-bishops Franz Joseph Friedrich Ambüel | |
| 1780 | 26 may | prince-bishops Franz Melchior Joseph Zen Ruffinen | |
| 1790 | 3 august | prince-bishops Joseph Anton Blatter | |
| 1798 | 16 march | Republic | Jakob Valentin Sigristen, Pierre de Chastonay, Charles Emmanuel de Rivaz |
| 1798 | 1 may | union to Switzerland | |
| 1802 | 3 april | Republic | Kaspar Eugen Baron von Stockalper de la Tour (I) |
| 1802 | 5 september | Antoine Marie Félix de Augustini | |
| 1807 | 22 may | Leopold de Sepibus | |
| 1809 | 6 december | Kaspar Eugen Baron von Stockalper de la Tour (II) | |
| 1810 | 12 november | Union to France | |
| 1813 | 31 december | Republic | Kaspar Eugen Baron von Stockalper de la Tour (III) |
| 1814 | 30 may | Johann Franz Joseph Taffiner | |
| 1815 | 4 august | 20° canton of Switzerland |