Sectarian violence among Christians is a recurring phenomenon, in which Christians engage in a form of communal violence known as sectarian violence. This violence can often be attributed to differences of religious beliefs between sects of Christianity (sectarianism). Sectarian violence among Christians was common especially during late antiquity and the years surrounding the protestant reformation, in which a German monk named Martin Luther disputed some of the Catholic Church's practices; particularly the doctrine of Indulgences, and was crucial in the creation of a new sect of Christianity known as Protestantism. During the latter half of the Renaissance was when sectarianism related violence was most common among Christians. Conflicts like the European wars of religion or Dutch Revolt