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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 874 | Independent state | Ingolfur Arnarson | ||
| 1262 | Part of Norway Kingdom | |||
| 1904 | 1 february | Danish self-governing State | Hannes Hafstein (I) | |
| 1909 | 31 march | Björn Jonssón | ||
| 1911 | 14 march | Kristján Jónsson | ||
| 1912 | 25 july | Hannes Hafstein (II) | ||
| 1914 | 21 july | Sigurdur Eggerz (I) | ||
| 1915 | 4 may | Einar Arnórsson | ||
| 1917 | 4 january | Jón Magnússon (I) | ||
| 1918 | 1 december | Kingdom united to Denmark | king Christian X | Jón Magnússon (I) |
| 1922 | 7 march | Sigurdur Eggerz (II) | ||
| 1924 | 22 march | Jón Magnússon (II) | ||
| 1926 | 8 july | Jón Thorláksson | ||
| 1927 | 28 august | Tryggvi Thórhallsson | ||
| 1932 | 3 june | Ásgeir Ásgeirsson | ||
| 1934 | 29 july | Hermann Jónasson (I) | ||
| 1942 | 16 may | Ólafur Thors (I) | ||
| 1942 | 16 december | Björn Thórdarson |