Giorgio Vasari, Lives of the Most Excellent Painters… (1850)
“ The form of a lion rampant, with double tail, may nevertheless be still discerned by whomsoever will examine the shield carefully. Andrea Pisano erected many towers around the circuit of the city walls for the same duke, and not only commenced the magnificent church of San Friano, which he brought to the state in which we now see it, but also raised the walls for the vestibule of all the gates of the city, with the smaller gates which were opened for the convenience of the people. ”
