St. Jadwiga was a Polish queen and a significant figure in the history of Poland. Born in 1374, she became the first female monarch of the country when she was crowned in 1384. St. Jadwiga is known for her piety, charitable works, and efforts to promote education and culture in Poland. She was also instrumental in the union between Poland and Lithuania, which strengthened both nations. St. Jadwiga was canonized as a saint by the Catholic Church in 1997, and her feast day is celebrated on October 16. Her legacy continues to inspire many in Poland and beyond.