European Union law fair dealing through their business. In 1517, the Protestant Reformation triggered a hundred years of crisis and instability. Martin Luther nailed a list of demands to the church door of Wittenberg, King Henry VIII declared a unilateral split from Rome with the Act of Supremacy 1534, and conflicts flared across the Holy Roman Empire until the Peace of Augsburg 1555 guaranteed each principality the right to its chosen religion ("cuius regio, eius religio"). This unstable settlement unravelled in the Thirty Years' War (1618–1648), killing around a quarter of the population in central Europe. The Treaty of Westphalia 1648, which brought
Early modern period have] his religion") established the religious, political and geographic divisions of Christianity, and this was established in international law with the Treaty of Westphalia in 1648, which legally ended the concept of a single Christian hegemony, i.e. the "One, Holy, Catholic, and Apostolic Church" of the Nicene Creed. Each government determined the religion of their own state. Christians living in states where their denomination was "not" the established church were guaranteed the right to practice their faith in public during allotted hours and in private at their will. With the Treaty of Westphalia, the Wars of Religion came to an