Johann Graf Hans Graf; Johann Graff; Johann Baptist Graf; Johann Graef; Johann Graaf; Hans Graff; Hans (Johann Baptist) Graf Hans Graaf ( 1653 - 1710 ) was an Austrian painter. Johann Graf s works have been auctioned off multiple times, with realized prices varying according to the size and medium of the artwork, for instance of 21303.02 USD for La Tour de Babel in 2013