Stephen I of Hungary was the first king of Hungary, ruling from approximately 1000 until his death in 1038. Born Vajk to Grand Prince Géza and Sarolt, he transformed the Hungarian state by unifying the Carpathian Basin and establishing a Christian kingdom. After succeeding his father, he consolidated power by defeating rival chieftains and securing his authority through a marriage to Gisela of Bavaria. As an apostolic king, he laid the foundations for the nation's religious and administrative structures, ensuring the country's independence and its integration into Christian Europe.