Person-of-Mystery

Welcome to Cipher Saturday!  You've found the home of everyone's favorite weekend pastime, where a stylized photo of a somewhat famous person from history is provided here for you to identify.

Additional clues may be found in the cipher below:

Dzh R gsv hrcgvvmgs li dzh R gsv hrcgs?
R tfvhh rg wvkvmwh lm nb mrugb szg girxp.
Lmob z xzkgzrm R dzh xzoovw tvmvizo yb xslrxv

Zmw gslfts R’n olmt tlmv blf xzm hgroo svzi nb elrxv.
Urhsrmt lu xlfihv dzh nb uzelirgv tznv,
yfg R’n z ovtvmw rm zmlgsvi hklig qfhg gsv hznv.

So, who could I be?  That's the mystery!  Go ahead and take a guess and then go enjoy your day.  Check back tomorrow and I'll reveal the answer.  The first correct post will be declared the winner.

If you'd like to make sure that your guess is correct, enter his name into Google Images and this photo will be found on the first pages of the image results.