Hoenheim is probably patterned after Rakoczi or the count of saint germain who, in history appears to be immortal...
BY THE WAY, ALCHEMY DO EXIST IN OUR WORLD. by Bombarding the nucleus of an atom and by a particle accelerator, we are able to make gold out of base metals. Physisists are the ones doing those.
FULL METAL PHYSICIST!^^
-freyja leafen BS applied Physics