Christian the Younger of Brunswick-Wolfenbüttel, a member of the House of Welf, titular Duke of Brunswick-Lüneburg and administrator of the Prince-Bishopric of Halberstadt, was a German Protestant military leader during the early years of the Thirty Years' War, fighting against the forces of the Imperial House of Habsburg, Habsburg Spain, and the Catholic League.

The Diocese of Halberstadt was a Roman Catholic diocese from 804 until 1648. From 1180, the bishops or administrators of Halberstadt ruled a state within the Holy Roman Empire, the prince-bishopric of Halberstadt. The diocesan seat and secular capital was Halberstadt in present-day Saxony-Anhalt.