It's a very incestuous kind of scene where you have the same companies lending to each other, borrowing from each other, and then trading with each other.
There were however issues with the marriage, which was condemned in 1049 by the Pope for being incestuous, since William and Matilda were third cousins once removed.
But what is uncontainable in tragedy is not just violence, it can be the mute presence of incestuous desire in Oedipus the King or even the fact of a traumatic wound in Philoctetes.