The Shakespeare didn't exist theory is pretty entertaining.
Ghengis Khan
many ottoman empire, roman empire and renaissance figures
Christopher Columbus
Ned Ludd, founder of the Luddites
Jesus
I'm pretty convinced that Jesus as a man never really existed, but is a combination of previous mythical figures put into the new testament, as a way to jump start a new religion and gain followers familiar with mythic figureheads of religious teachings, in order to control the people.
Even if there was a man who fit the description of Jesus, the biblical description of his birth shows he would have been born in the spring, not during the winter solstice week or saturnalia. You can change the birthdate of a fictional character, but not a real person.
I'm hoping to wake up from this nightmare and discover that the Fake President never existed. Then I'd turn on the TV to hear Hillary speaking from the White House. Will someone pinch me, please?
Wouldn't that just be absolutely wonderful?