It seems like I missed reviewing a book or two in the last few weeks, but I'm not going to try to sort that out today. I did poke through Frances Wood's Did Marco Polo Go to China? which I rather liked, although it hardly matters whether he did or not at this point.
There are lots of historical records like that though, like whether 123 British prisoners really die in the Black Hole of Calcutta. It doesn't matter anymore if they did; what matters is that enough people in Britain believed that they did and it contributed to changing the course of Indian history. And it doesn't matter if Marco Polo actually went to China because enough people believed he did. (George Bush and company used this tactic nicely in 2003, didn't they?)
Anyway. Check out the link on the sidebar about grayness and dreams.