
So far we have seen an almost unbroken sequence of attempts by various popes to complete the Trevi fountain: Clement VIII in 1600, Paul V in 1615 and Urban VIII in 1640. I have already told you how Urban’s successor, Innocent X Pamphili (1644-55), had only one fountain built during his pontificate – the Four Rivers – and that for it, he diverted 150-180 ounces of water from the Trevi fountain. Such action proves not only that he was not interested in the Trevi but also that he had abandoned the matter once and for all because, for him, the problem of a showpiece for the Aqua Vergine had been solved by his fountain in Piazza Navona.
This seems all the more true when we remember that, in a way, Alexander VII (Chigi, 1655-67) followed in Innocent’s footsteps. In fact, in the brief note from the Chigi Codice which I mentioned on page 106, stated that in the spring of 1667 he proposed moving “the Trevi display fountain to Piazza Colonna” – the square where his family’s huge residence stood, and still stands to this day.
To solve the problem of the Trevi, Bernini probably had another amazing idea in mind: to move Trajan’s column and pair it up with the column of Marcus Aurelius that was already there, and then to create two huge fountains around the columns. In summer, the fountains could have been used to flood poor Piazza Colonna.
Apart from this crime that did not come off – which we know about thanks to some statements Bernini made during his short stay in France in 1665 – we have two designs by Pietro Berrettini da Cortona. These are important mainly because they solve the problem of the Trevi with a gigantic façade-cum-fountain, probably intended to face east, so it is very likely true that Pietro da Cortona based his overall arrangement (except for some of the details, i.e. the huge rocks) on the design that Gian Lorenzo had prepared for Urban VIII’s fountain in 1640, if not on another design by the same artist, which we shall examine later.