United Baltic Duchy

United Baltic Duchy
Vereinigtes Baltisches Herzogtum (German)
Apvienotā Baltijas hercogiste (Latvian)
Balti Hertsogiriik (Estonian)
1918
United Baltic Duchy flag
Coat of arms
Proposed territories for the United Baltic Duchy
StatusClient state of the German Empire
CapitalRiga
Common languages
Demonym(s)German
GovernmentProvisional semi-constitutional monarchy under military occupation
Duke-elect 
 1918
Adolf Friedrich
Regent 
 Nov 1918
Adolf Pilar von Pilchau
Historical eraWorld War I
3 March 1918
 Proclamation of Duchy by Baltic German nobility
12 April 1918
 Recognized by Germany
22 September 1918
 Regency Council established
5 November 1918
11 November 1918
 Regency Council disbanded
28 November 1918
Preceded by
Succeeded by
Duchy of Courland and Semigallia (1918)
Ober Ost
Estonia
Latvia
Today part of

The United Baltic Duchy (German: Vereinigtes Baltisches Herzogtum; Latvian: Apvienotā Baltijas hercogiste; Estonian: Balti Hertsogiriik), or alternatively the Grand Duchy of Livonia, was the name of a short-lived state during World War I that was proclaimed by leaders of the local Baltic German nobility.

The attempt to establish a new client state of the German Empire on the territory of what is now Latvia and Estonia was made in 1918, during the German occupation of the former Courland, Livonian and Estonian governorates of the Russian Empire; which had ceased to exist after the Bolshevik coup in 1917. The unsuccessful proclamation of a pro-German duchy was first made in April 1918, after the Republic of Estonia had already formally declared full independence.

The proposed ideas for the new state included the creation of a Duchy of Courland and Semigallia and of a Duchy of Estonia and Livonia, which would be in personal union with the Kingdom of Prussia.