Jadwiga of Poland
The rule of the Jagiellonian dynasty in Poland between 1386 and 1572 spans the late Middle Ages and early Modern Era in European history. The dynasty was founded by the Lithuanian Grand Duke Jogaila (Władysław II Jagiełło), whose marriage to Queen Jadwiga of Poland formed a Polish–Lithuanian union. The partnership brought vast territories controlled by the Grand Duchy of Lithuania into Poland's sphere of influence and proved beneficial for both the Polish and Lithuanian people, who coexisted and cooperated in one of the largest political entities in Europe for the next four centuries.