Portrait of Bartolomeo Colleoni

The
  painting is a typical example of a commemorative portrait, linked to the
  celebration of family or public glories. The
  painter follows the fifteenth-century iconographic model, with a medal-like
  outline of a perfect profile, but adds a force of expression and naturalness
  new to this type of portrait.
  And the
  lapidary inscription underlines the historical value of the painting.