The Thirty Years War was a 17th century religious conflict initially in Central Europe.The war lasted from 1618 to 1648,starting as a battle among the catholics and the Protestants that formed the Holy Roman Empire.The war brought famine and disease in Europe.
But as the war evolved,it became less of a religious war and more of a thing that which group would govern Europe.
This conflict changed the geopolitical face of Europe and the role of religion and nation - states in society.