If these people lived before the early 1900's that means their IQ score is projected. If they lived after that period than it most likely is their real IQ without any projections. If you know of anyone else that should be on this list you should make a comment or add it to the end of the list and I will rearrange the list.
http://www.ranker.com/list/highest-iq-scores-ever-recorded-and-projected/stokified,
Albert Einstein
225
Nikola Tesla
230-320
William James Sidis
250-300
Adragon De Mello
400
Ainan Cawley
263-349
Marnen Laibow-Koser
268
K. Vishalini
225
Carl Gauss
250-300
Andrew Magdy Kamal
232
Michael Kearney
325