The fountain , designed by Raffaelo Sangallo in 1568 - 69 , is framed by two doric columns .
The fountain , designed by Raffaelo Sangallo in 1568 - 69 , is crowned by a 4th - century marble bust of the Emperor Constatine .
The fountain , designed by Raffaelo Sangallo in 1568 - 69 , is framed by two doric columns , and crowned by a 4th - century marble bust of the Emperor Constatine .