I Riigikogu was the first legislature of the Estonian Parliament (Riigikogu).
The legislature was elected after 1920 elections (held on 27–29 November 1920).
It sat between 20 December 1920 and 30 May 1923, before the next round of elections were held.
The 1920 general election distributed the 100 seats as follows: Chairmen: First Assistant Chairman: Second Assistant Chairmen: Secretaries: First Assistant Secretary Second Assistant Secretary
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