A polymath is a person whose expertise spans a significant number of different subject areas. Leonardo Da Vinci, Rabindranath Tagore and Benjamin Franklin come to mind, thinking of polymaths.
Omar Khayyam was a mathematician, philosopher, astronomer and poet.
http://en.wikipedia.org/wiki/Omar_Khayyám What an interesting life he would have led, dabbling in such diverse areas. Reading the literal meaning of his quatrains and the translations by Fitzgerald I was struck by how it occurred to the translator to interpret the verses in such manner. Of course, any literary work would shine through only if read in original. Bengali, Urdu, Spanish ........Forget it, to read Kurunthogai and Kamba Ramayanam is in itself an herculean task - you need the help of Tamil Agarathi to make sense of literary Tamil.