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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1180 | Part of Sweden | ||
| 1569 | Lordship | Katarina Stenbock | |
| 1621 | 13 november | Lordship of King of Sweden | |
| 1809 | 29 march | Union to Finland under Russian Empire | |
| 1917 | 6 december | Part of Finland | |
| 1922 | 9 june | Finland self-governing region |