Who is Senneval from The 120 Days of Sodom and Other Writings and what is their importance? 120_Days_of_Sodom English & Literature Senneval | The 120 Days of Sodom and Other Writings

This individual is the lost son of Courval, the lover of Florville, and the father of Saint-Ange. Senneval has an affair with the young Florville, neither knowing that they are siblings. She gives birth to a son, who Senneval takes away to be raised. He is a soldier, and returns from a campaign to find that his son has been killed after raping a woman. That woman is Florville. It is Senneval who provides the missing information to Florville that causes her to realize her true identity.