10% more...or less. I can't tell the difference between Whizzo and a dead crab!

I've been doing too many of these so I'll put up a very easy one, in the hopes that somewhere out there there must be someone who...*prepares to sing*
CUT that out, cut that out!

What's the name of the princess that prince Herbert of Swamp Castle was supposed to marry for her huuuuuge tracts of land?