Actors who have played a lot of real people in movies

Charlton Heston:

Moses
John the Baptist
Marc Antony
Michaelangelo
General Charles Gordon
Lt. William Clark
Buffalo Bill Cody
Rodrigo Diaz aka El Cid
Andrew Jackson

Heston also played real-life characters in several TV movies.
It could be argued that he played all of the above characters pretty much the same way.