Polish–Lithuanian union

The term "Polish-Lithuanian union" refers to a series of acts and alliances between the Kingdom of Poland and the Grand Duchy of Lithuania that led to the creation of a Polish-Lithuanian union — the "Republic of the Two Nations" — in 1569 and eventually to the creation of a unitary state in 1791.

The most important acts in the process of union were:

• 1385 - Union of Krewo - a personal union;
• 1401 - Union of Vilnius and Radom - Lithuania was granted vast autonomy, with Vytautas as Grand Duke and Władysław Jagiełło as his overlord;
• 1413 - Union of Horodło;
• 1432 (1432-34) - Union of Grodno;
• 1499 - Union of Kraków and Vilnius;
• 1501 - Union of Mielnik;
• July 1, 1569 - Union of Lublin - creation of the Republic of the Two Nations;
• May 3, 1791 - Polish Constitution of May 3, 1791: the Kingdom of Poland and the Grand Duchy of Lithuania were abolished, and a common state was created in their place.