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| 1920–22 |
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| Suppression of rebellions in Gilan, Khurasan, Azerbaijan, and Kurdistan. | 1 |
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| 1920 |
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| The population of Iran reached 12 million. Muslims (about 80 percent of whom were Twelver Shi’ites) made up 95 percent of the total. Approximately 80 percent of the inhabitants lived in the countryside. | 2 |
| RIZA KHAN assumed command of the Cossack Brigade, the main military organization of the Iranian government. | 3 |
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| Jan. 10 |
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| Iran became one of the charter members of the League of Nations. | 4 |
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| May 18 |
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| Bolshevik occupation of most of Gilan, where the Soviet Republic of Gilan operated until Oct. 1921. | 5 |
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