The great who died unknown...

I am looking for a poem that has a line that says, "It is not the known great, but the great who died unknown." I believe that this is a Bukowski poem, and was hoping someone would be able to identify it for me.
After reading this, I could simply stop. What more can there be?
(Un?)-Fortunately,...i know there is more.
What a great piece. What a great piece.