1125 Clementius, a peasant from Bucy near Soissons, France, formed a heretical group teaching that human reproduction was evil. His followers engaged in exclusively homosexual relationships, except for rare orgies. Babies which resulted from orgies were said to have been burned at birth and their ashes made into communion bread. Clementius’s followers did not believe in the bodily incarnation of Christ, but they held instead that he was but a phantasm. They also taught that the altar was “the mouth of hell” and the sacraments were of no value. Clementius was arrested and sentenced to imprisonment for life.
There's more about Clementius and one of my own relations, Everard of Bucy, in Formation of a Persecuting Society: Authority and Deviance in Western Europe 950-1250 by R.I. Moore. From Amazon: "The Tenth to the Thirteenth centuries in Europe saw the appearance of popular heresy and the establishment of the inquisition: expropriation and mass murder of Jews: the foundation of leper hospitals in large numbers and the propagation of elaborate measures to segregate lepers from the healthy. These have traditionally been seen as distinct and separate developments, and explained in terms of the problems which their victims presented to medieval society. In this stimulating book Robert Moore argues that the coincidences in the treatment of these and other minority groups cannot be explained independently, and that all are part of a pattern of persecution which now appeared for the first time to make Europe become, as it has remained, a persecuting society."
