Christian III of Denmark was a king who ruled from 1534 to 1559. He was a member of the House of Oldenburg and is best known for establishing Lutheranism as the state religion in Denmark. His reign marked a significant shift in the country's religious landscape, moving away from Catholicism. During his rule, Christian III focused on strengthening the monarchy and centralizing power. He implemented various reforms in governance and the economy, which helped stabilize Denmark after the Count's Feud, a civil war that had weakened the nation. His efforts laid the groundwork for a more modern Danish state.