@Aizawa.mood To my understanding, and I may be wrong, she was captured with the idea o killing her and her kids. The emperor wanted the grand duke R alive to have people fighting the throne and create distractions. He thought he will gladly sacrifice his family to keep living, because the emperor would not hesitate to do that. The plan was to make the R look bad to the east who are in conflict with the emperor. And idk how make them lose power by making them disband (?) . You see, R was the one the east align themselves with. Now everything has backfired and the duchess will be a martir