Do you have any idea what the Mayflower Society says about the ancestry (and wife!) of Henry Howland, father of Pilgrim John Howland?
On the RootsWeb WorldConnect, I found one entry for Henry Howland that said the entire line starting with John Howland and Emma Revell was first published in the 1930s and later proven wrong.
With the quality of research that the Mayflower Society is putting into its 5-generation books, it seems to me that they would know if John Howland's ancestry has been proven further back than Henry Howland.
Unfortunately I am not in a location where I can check their publications . . . sigh . . .