Christian III reigned as King of Denmark from 1534 and King of Norway from 1537 until his death in 1559. During his reign, Christian formed close ties between the church and the crown. He established Lutheranism as the state religion within his realms as part of the Protestant Reformation, and was the first King of Denmark-Norway.

Lutheranism is a major branch of Protestantism, identifying primarily with the theology of Martin Luther, the 16th-century German monk and reformer whose efforts to reform the theology and practices of the Catholic Church launched the Protestant Reformation.