István I, also known as Saint Stephen, was the first King of Hungary, reigning from 1000 to 1038. He is credited with establishing the Christian state of Hungary and played a crucial role in converting the nation to Christianity. His efforts helped to unify the various tribes in the region and laid the foundation for the future development of the country. Stephen was canonized as a saint by the Catholic Church in 1083, and his feast day is celebrated on August 20. He is remembered for his leadership, religious devotion, and contributions to the cultural and political landscape of Hungary.