Fontana del Nettuno (Fountain of Neptune) was built between 1563 and 1566 by the Flemish sculptor Giambologna. It is a symbol of the power of the Pope: he ruled the world like Neptune ruled the seas. At the feet of the statue there are four little angels. They represent the rivers of the four discovered continents at that time: Ganges, Nile, Amazon River and Danube.