In the rebellion led by the Creator's prophet, two ducal houses actually teamed up to support him. One was naturally Marcus Lilac's own House, and the other, of course, the one which seemed the most lowkey of all the ducal families, House Jasmine.
When the members of the imperial family heard of this, the hearts of these people holed up in the Church sank. It was just unbelievable! Because House Jasmine was actually the maternal root of the current Emperor. The late Empress was from this clan!
Marcus' family was also connected by blood to the imperial family. Actually, all the ducal houses apart from House Wade had some degree of blood relation to the Natividads. The web of relations had acted as an invisible string tying the four most prestigious families together. This explained why the people were so shocked upon hearing that those two clans wanted to revolt.