This is a unique portrait for the Florence of it's time.
It was very unusual for portraits to be composed with
a veiw from or to the outside landscape. Botticelli has
painted Giuliano in front of an open door, which in Florentine
humanistic symbolism meaning death or the passage from
life to the hereafter. It has been dated to 1478 as it
is believed that Lorenzo commissioned the work immediately
after Giuliano's assassination. Even more precisely, this
puts that painting to the second half of May 1478, making
it the most accurately dated Botticelli work known.