King Sigismund of Hungary (1368-1437) was a significant monarch who ruled from 1387 until his death. He was also the King of Croatia and later became the Holy Roman Emperor. Sigismund was known for his efforts to strengthen the central authority of the monarchy and for his involvement in various military campaigns, including the fight against the Ottoman Empire. Sigismund played a crucial role in European politics during his reign, participating in the Council of Constance and promoting reforms within the Catholic Church. His reign was marked by both challenges and achievements, including the establishment of the Order of the Dragon, which aimed to defend Christianity in Eastern Europe.