Prussia was founded in 1932.
Duchy of Prussia . The Duchy of Prussia was elevated to the Kingdom of Prussia in 1701 . 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 . For centuries , the House of nocat = y ruled Prussia , successfully expanding its size by way of an unusually well-organised and effective army . Prussia entered the ranks of the great powers shortly after becoming a kingdom , and exercised most influence in the 18th and 19th centuries . During the 18th century it had a major say in many international affairs under the reign of Frederick the Great .