Peter Abélard (1079-1142) was one of the most influential writers and thinkers of the twelfth century, famous for his skill in logic as well as his romance with Heloise. His Collationes --or Dialogue between a Christian, a Philosopher, and a Jew--is remarkable for the boldness of its conception and thought.
Nominalist application of French theologian, philosopher, and composer Peter Abelard or Pierre Abélard of the principles of ancient Greek logic to the doctrines of the medieval Catholic Church led to charges of heresy; after his pupil Héloise, his pupil and the object of his lust affair, bore him a child, he secretly married her, whose angered family castrated him, after which he served as a monk.