Abelard's affair, marriage, and castration
Peter Abelard, the most celebrated logician in Paris around 1115, became tutor to Heloise, the learned niece of the canon Fulbert, and began an affair with her; she bore a son, Astralabe, and they married secretly at Abelard's insistence despite her objections. When Fulbert believed Abelard had cast Heloise off by placing her in the convent at Argenteuil, he had Abelard castrated by hired men, after which Abelard became a monk at Saint-Denis and Heloise took the veil.