What were the causes and consequences of religious violence?

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Iconoclasm in the NetherlandsCalvinist men and women break stained-glass windows, remove statues, and carry off devotional altarpieces. Iconoclasm, or the destruction of religious images, is often described as a “riot,” but here the participants seem very purposeful. Calvinist Protestants regarded pictures and statues as sacrilegious and saw removing them as a way to purify the church. (The Fotomas Index/The Bridgeman Art Library)

IIN 1559, FRANCE AND SPAIN SIGNED the Treaty of Cateau-Cambrésis (CAH-toh kam-BRAY-sees), which ended the long conflict known as the Habsburg-Valois wars. Spain was the victor. France, exhausted by the struggle, had to acknowledge Spanish dominance in Italy, where much of the fighting had taken place. True peace was elusive, however, and over the next century, religious differences led to riots, civil wars, and international conflicts. Especially in France and the Netherlands, Protestants and Catholics used violent actions as well as preaching and teaching against each other. Catholics and Protestants alike feared people of other faiths, whom they often saw as agents of Satan. Even more, they feared those who were explicitly identified with Satan: witches living in their midst. This era was the time of the most virulent witch persecutions in European history because both Protestants and Catholics tried to make their cities and states more godly.