Corruption, loose morals, depravity – the German monk Martin Luther had enough of this and demanded a pure church and a pure faith. His goal was nothing less than a revolution: the Reformation of the church and the ousting of the "depraved" popes. Instead, the freedom within every Christian believer was to be expressed. The first example was the Peasants' Wars. Christianity once again became divided after the downfall of Byzantium: there were now Catholics, Lutherans and Reformed, for the rebels soon went their own way. The new longing for a purer Christianity soon led to the biggest catastrophe in Europe, the Thirty Years' War. It was not foremost a religious war, although it was easier to kill more mercilessly without a legitimation than have to worry about "eternal life." Europe lost half of its population during this era. One witnessed the horror of the hordes of soldiers dragging themselves throughout Europe, and the abandonment to the most vicious acts that man is capable of.