When Vasari wrote in 1568, the dead sculptor's friend, Tommaso dei Cavalieri, was proceeding with the work.

There is every reason, therefore, to assume that the latter building, at any rate, fairly corresponds to his intention.

Vignola and Giacomo della Porta, both of them excellent architects, carried out the scheme, which must have been nearly finished in the pontificate of Innocent X.( 1644-1655).
Like the cupola of S.Peter's, the Campidoglio has always been regarded as one of Michelangelo's most meritorious performances in architecture.

His severe critic, M.Charles Garnier, says of the Capitol: "The general composition of the edifice is certainly worthy of Buonarroti's powerful conception.

The balustrade which crowns the facade is indeed bad and vulgar; the great pilasters are very poor in invention, and the windows of the first story are extremely mediocre in style.