Reciprocal Guarantee of Two Nations
The Reciprocal Guarantee of Two Nations (Polish: Zaręczenie Wzajemne Obojga Narodów; also Reciprocal Warranty of Two Nations and Mutual Pledge of the Two Nations) was an addendum to the Polish Constitution of May 3, 1791, adopted on 20 October 1791 by the Great, or Four-Year, Sejm, which stated implementing principles that had not been spelled out in the May 3rd Constitution. The document specified the nature of the Polish–Lithuanian union, affirming the unity and indivisibility of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania within a single state.
The document was to be an integral part of the "Pacta conventa", and thus was to be binding on King Stanisław August Poniatowski and all subsequent monarchs of the Polish-Lithuanian state. The document defined the federal character of the state and asserted the equality (equal representation within bodies of state governance) of its two constituents (the Crown of the Kingdom of Poland, and the Grand Duchy of Lithuania).
The document declared that the Polish–Lithuanian Commonwealth (now to be known as Rzeczpospolita Polska — the Polish Republic, or Polish Commonwealth) remained a union of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania. It specified that they shared a common government, military, and treasury (though Lithuanian tax revenues were expressly to be spent within the Grand Duchy of Lithuania).
The military and treasury commissions were to have equal numbers of Polish and Lithuanian members and were to be presided over by Polish and Lithuanian officials on an alternating basis. The membership of the Police Commission was to be two-thirds Polish-Crown and one-third Lithuanian.
Poland and Lithuania were to have the same numbers of principal officials.
In the view of historians Stanisław Kutrzeba, Oskar Halecki and Bogusław Leśnodorski, the legislation adopted by the Four-Year Sejm, including the Mutual Pledge of the Two Nations, replaced the erstwhile union of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania that had existed since the Union of Lublin (1569), with a unitary Polish Commonwealth, or Polish Republic.
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- Carin Laurin, Baltic Yearbook of International Law, vol. 8, 2008, p. 349.
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- Jonathan Dewald, Europe 1450 to 1789: Encyclopedia of the Early Modern World, Charles Scribner's Sons, 2004, ISBN 0-684-31203-4
- Bardach, Juliusz (1992). "The Constitution of May Third and the mutual assurance of the Two Nations". The Polish Review 36 (4): 407–420. Retrieved 18 April 2014.
- (Polish) Text of the document