The Union of Lublin treaty, uniting the Kingdom of Poland and Grand Duchy of Lithuania and establishing the Polish–Lithuanian Commonwealth, is signed on July 1, 1569, lasting for over 200 years.
The treaty was signed in Lublin, Poland, at a joint assembly of Polish and Lithuanian deputies., creating one of Europe's largest countries with a shared monarch, parliament, and currency. The Union lasted for 226 years until the Commonwealth's final partition by Russia, Prussia, and Austria in 1795, making it one of Europe's longest-lasting unions of states.
