Mary Seacole: Sadly, The History Does Not Stack Up.

http://www.dailymail.co.uk/news/article-2255095/The-black-Florence-Nightingale-making-PC-myth-One-historian-explains-Mary-Seacoles-story-stood-up.html
Well - as always with leftist heroes - you do need to dig a bit deeper. I feel such a sense of letdown when the truth was revealed. Worst of all - I feel that Mary would have been the person most unhappy with this myth.