In the imaginary triangle now delineated by the edges of Piazza Montecitorio, Piazza della Rotonda and Piazza Sant'Ignazio there once stood the "Hadrianeum", dating from the second century A.D., which included the latter remains almost intact, facing on to Piazza di Pietra, with eleven of the original trirteen Corinthian columns.
At the centre of the area of this ancient Hadrianic complex there now stands Piazza Capranica, near which are to be found other huge columns in cipolline marble from ancient temple. One stump of these is still visible in vicolo della Spada di Orlando.
S.Maria in Aquiro, the curch wich faces on to the piazza, was one of the most ancient diaconal churches, with remote origins going back perhaps as early as the pontificate of Anastasius I, in the fourth century A.D.. In the course of the centuries this church underwent various reconstructions, and numerous architectural changes, among these being the restoration ordered by Cardinal Antonio Maria Salvati, wich transformed it into a Latin cruciform church with three naves, thus giving it its present appearance.

Beside the Church of Santa Maria in Aquiro is the Palazzo Capranica, built in several stages by Cardinal Domenico Capranica (1400 - 1458). It was begun in 1425 and incorporated into the palace as it was built a chapel dedicated to Saint Agnes and several houses standing in the Piazza. Among these, in 1449, there was the property of the present entrance to the Collegio Capranica and the cinema.
This part, the present "Enoteca Capranica" Restaurant, has preserved right up to the present the original structure which it possessed in those days, apart from some reinforcing arches which were built at the end of the seventeenth centutry to support the weight of the theatre stage. The most ancient parts are that on the right, with the twin-mullion windows, and the tower.
The Palazzo Capranica is a typical town mansion of the Roman nobility from the pre-Renaissance period, other examples of which were the Vatican Palace of Nicholas V, and Pietro Barbo's Palazzo Venezia.
Cardinal Domenico Capranica was born in Rome, son of a courtesan of the Colonnas, the lord of Capranica Prenetsina, from which he took his name.

He was a distinguished scholar of philosophy and theology, and the author of various boos. In 1465 he founded the "Almo Collegio Capranicense" with the aim of educating meritorious but poor youngsters, who would enter on an ecclesiastical career. The College is still active, and enjoys the patronage of the Popes: priests who were to become distinguished prelates, cardinals and popes (including Pius I and VI) have been educated there.
In 1694, a theatre with a U-plan and six orders of seats, open to the public, was built from an original private theatre-salon to the design of Carlo Buratti.
Subsequently, it was rebuilt in 1775 by Egidio Marescotti. In the theatre performances were given of musical and prose works, and even performances of opera buffa: these were the years when Carlo Goldoni personally attended a performance of his play "Pamela maritata" written especially for this theatre.
In 1853, the theatre was rebuilt in masonry by Gaspare Servi, and in 1922 it was finally transformed into a cinema.