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The Constitution of May 3 (the first modern constitution in Europe) is proclaimed by the Sejm of Polish–Lithuanian Commonwealth.

Historical image related to The Constitution of May 3 (the first modern constitution in Europe) is proclaimed by the Sejm of Polish–Lithuanian Commonwealth. from May 3, 1791

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…
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Constitution

Fundamental principles that govern a state

A constitution, or supreme law, is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organization or other type of entity, and commonly determines how that entity is to be governed.
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Sejm

Lower house of the parliament of Poland

The Sejm, officially known as the Sejm of the Republic of Poland, is the lower house of the bicameral parliament of Poland.
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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…
Source: Wikipedia (CC BY-SA)