Original: August 14 — The Union of Krewo establishes the Jagiellonian dynasty in Poland and Lithuania through the proposed marriage of Queen Jadwiga of Poland and Grand Duke Jagiello of Lithuania, and sees the acceptance of Roman Catholicism by the Lithuanian elite.
Simplified: August 14 - The Union of Krewo establishes the Jagiellonian dynasty in Poland and Lithuania through the proposed marriage of Queen Jadwiga of Poland and Grand Duke Jagiello of Lithuania and saw the acceptance of Roman Catholicism by the Lithuanian elite.