SYMBOLS Titlepage of Goltzius, Icones Imperatorum Romanorum, 1645. The three Emperors portrayed are Julius Caesar (who carries in his right hand a statuette of Victory, and in the other hand, the Orb of Power), Constantine the Great (who was the first Emperor to promote Christianity, and who bears the Chi-Rho symbol on his banner), and Rudolph I. The symbols in the foreground include the rudder (symbol of direction) and the Ouroboros, or serpent devouring its own tail - a classical symbol of Time.