Short answers, pulled from the story.
The concept of the Crown of the Kingdom of Poland began to take shape in 1385 when the Union of Krewo marked a turning point. Before this moment, the idea had emerged in Central Europe during the 12th century but lacked distinct statehood.
Jan Radlica became the first royal chancellor to stop referring to himself as 'of Kraków' or 'of the court' and instead adopted the title regni Poloniae supremus cancellarius in 1381. This change reflected the shift toward recognizing the Crown as a sovereign entity rather than just the monarch's personal property.
On the 13th of August 1385 at Kreva Castle, Lithuanian Grand Duke Jogaila signed prenuptial agreements with Polish lords offering Queen Jadwida's hand. Once confirmed on August 14, Poland and Lithuania formed a personal union under these terms.
After the Union of Lublin in 1569, Crown lands were divided into two provinces known as Lesser Poland and Greater Poland. These territories were further subdivided into administrative units called voivodeships including Brześć Kujawski Voivodeship, Gniezno Voivodeship, and Kraków Voivodeship.
The Constitution of the 3rd of May 1791 represented the second-oldest codified national constitution in history and the oldest codified national constitution in Europe. Drafting began the 6th of October 1788 and lasted 32 months before Great Sejm convened to adopt it on the 3rd of May 1791.