Estonia
State · 1919–1939 CE · at its largest around 1920 CE
Baltic republic that won its independence from Russia in the War of Independence of 1918–1920. It was occupied and annexed by the Soviet Union in 1940 under the Molotov-Ribbentrop Pact.
On its lands while it lasted
- Tallinn (c. 1919 CE): Capital of Estonia (1919–1939), Republic of Estonia (1992–today).
More on Wikipedia.