The Polish-Lithuanian Commonwealth started as a "personal union" of the King of Lithuanian in 1386, when Jagiello married the Polish queen Jadwiga (who died in childbirth). That is, the same "king," ruled both countries, separately, not as a unified country.
In the same year, the dynastic bond between Poland and Lithuania was transformed into a constitutional relationship by the Acts of the Lublin Diet, which described the Polish-Lithuanian state as a Commonwealth of Both Nations (Rzeczpospolita Obojga Narodów).
The struggle with Moscow continued over the next two centuries. Until 1569 the union of Lithuania and Poland remained a loose alliance by virtue of a common ruler. On July 1, 1569, a common Polish-Lithuanian parliament meeting in Lublin transformed the loose personal union of the two states into a Commonwealth of Two Peoples. While Poland and
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why did poland and lithuania unite
