Whenever there are more than 2 generations difference between my relationship and others' relationship to an historical figure, I check the path to make sure it's a good path. It's how I found out that I was not a direct descendant of Llewlyn :)
As much fun as it is to be related to historic figures, sometimes the paths are incorrect and need to be reviewed. For every historic figure I disprove a relationship to, another turns up who is actually an ancestor.