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The Great Sejm of the Polish–Lithuanian Commonwealth ratified the first codified national constitution in Europe.

Historical image related to The Great Sejm of the Polish–Lithuanian Commonwealth ratified the first codified national constitution in Europe. from May 3, 1791

Great Sejm

1788–1792 Polish-Lithuanian parliament

The Great Sejm, also known as the Four-Year Sejm was a Sejm (parliament) of the Polish–Lithuanian Commonwealth that was held in Warsaw between 1788 and 1792. Its principal aim became to restore sovereignty to, and reform, the Commonwealth politically and economically.
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Polish–Lithuanian Commonwealth

Bi-confederate monarchy in Europe (1569–1795)

The Polish–Lithuanian Commonwealth, also referred to as Poland–Lithuania or the First Polish Republic, was a federative real union between the Kingdom of Poland and the Grand Duchy of Lithuania, existing from 1569 to 1795. This state was among the largest, most populated…
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Constitution of 3 May 1791

Polish-Lithuanian constitution

The Constitution of 3 May 1791, titled the Government Act, was a written constitution for the Polish–Lithuanian Commonwealth that was adopted by the Great Sejm that met between 1788 and 1792. The Commonwealth was a dual monarchy comprising the Crown of the Kingdom of Poland and…
Source: Wikipedia (CC BY-SA)