The Dragon did not ask for a highborn virgin. Or a virgin at all. It may have been what was expected, but the Dragon figured as King, it's word was law. Not to mention, virgins had a rather sour, bitter taste to them.
No, if the Dragon was going to eat, it was going to eat smart. It asked Wonse who the foremost authority on it;s cousins was, and was told that it was Lord Saul Ramkin, 'confirmed' bachelor. Wonse was ordered forthwith to bring Lord Ramkin to him, for supper.
Eliminate the biggest threat, the Dragon thought.
Or, how Guards!Guards! would have worked with Saul
