The kingdom of Prussia existed from September 2, 1701 to October 7, 1918.
The Kingdom of Prussia ( Königreich Preußen ) was a German kingdom that constituted the state of Prussia between 1701 and 1918 and included parts of present-day Germany , Poland , Russia , Lithuania , Denmark , Belgium and the Czech Republic . Prussia . The Kingdom of Prussia was thus abolished in favour of a republic -- the Free State of Prussia , a state of Germany from 1918 until 1933 .