S. Maria in Aracoeli
probably occupies the site of the Temple of Jupiter. Its present altar encloses an ancient altar which is said to have been erected by Augustus. "According to a legend of the 12th century, this was the spot where the Sibyl Tibur appeared to the emperor, whom the senate proposed to elevate to the rank of a god, and revealed to him a vision of the Virgin and her Son."
This church is approached by a very high flight of steps rising from the foot of those leading to the piazza of the modern Capitol, and "the interior is vast, solemn, and highly picturesque. It was here, as Gibbon tells us, that on the 15th of October, 1764, as he sat musing amidst the ruins of the Capitol, while the barefooted friars were singing vespers, the idea of writing the 'Decline and Fall' of the city first started to his mind."