I'd do it for you...

Although I can't imagine anyone but Mary Elizabeth Mastrantonio playing Maid Marion in Robin Hood: Prince of Thieves according to Kevin Reynolds on the audio commentary to the dvd the part was originally going to be filled by Robin Wright Penn, but she became pregnant and was unable to do it, so Mastrantonio stepped into the breach (so to speak). If you want to see how the Wright version might have turned out she previously played Princess Buttercup in The Princess Bride. On reflection it might have been confusing to have two Robins on the set, even if one of them might have been fictional.