regardless of how much your 'imperium' is worth?
I would sign a pre-nup. . . infact I'd insist on it.
In as much as we all like believe in the perfect future, it rarely turns out the way we hope. . . it is a realistic thing to do. its rather naive to think that the fact that a pre-nup being discussed in the first place means d marriage is doomed. . in my opinion it is a start to a very realistic relationship. . . fairly tales r nice and all but poo does happen, best be prepared!
In theory I would do it because never let it be said that I was marrying for money.
Principle-wise though I don't really like the idea of that "in case our marriage fails" clause. I don't think before you marry someone you should be contemplating failure. In any case if my husband was breaking up with me, I wouldn't want his stinking cheating anything including his money.