By the time Fulbert realized what was going on and ordered Abelard to leave his home, Heloise was pregnant. Abelard took her with him to Brittany, where she gave birth to a son they named Astrolabe. (They placed the boy in the care of Abelard's sister Denise.) Abelard proposed marriage, and Fulbert was agreeable—not least because he would have one of the most admired men in France for an adoptive son-in-law. Surprisingly, it was Heloise who objected, on the grounds that marriage would ruin Abelard's chances for advancement in the church, and that family responsibilities would keep him from his work. Furthermore, she maintained that their love was stronger than any legal vows.
Nevertheless, they went ahead with the marriage, which they kept secret to protect Abelard's reputation. Soon, however, Fulbert began bragging about the fact that Abelard was his relative, and when the two publicly denied that they were married, Fulbert became abusive toward his niece. Abelard arranged for Heloise to escape to a convent, or nunnery, in Argenteuil (ar-zhahn-TWEE).
Fearing that Abelard intended to force Heloise to become a nun, thereby breaking off the marriage, Fulbert decided to take revenge. He bribed Abelard's servant to leave his master's door unlocked, and one night Fulbert, accompanied by a few hoodlums, broke into Abelard's bedroom and castrated him.
Despite the many enemies he had made, Abelard had many friends as well, and the public was outraged when they learned what had happened. Abelard's servant and one of Ful-bert's henchmen were captured, blinded, and castrated; as for Fulbert, he lost his position and was forced to leave the city.