The history and breadth of the square began in 16th century, when Cardinal Alessandro
Farnese, future
Paul III, bought several houses on the square to demolish them and create an appropriate space
palazzo which he had designed by
Antonio da Sangallo the Younger. The works began in 1514, were interrupted by the
sack of Rome of 1527, and resumed after the election of the cardinal to the papal throne with the name of Paul III and, from 1546, under the direction of
Michelangelo. The square was paved in 1545, with a brick as a sort of pertinence of the building, and there was placed for ornamental purposes, in axis with the entrance on the facade, one of the two Egyptian granite tanks present today. According to
Moroni (and the news was in Flaminio Vacca, Memories of various antiquities found in different places in the City of Rome, written by Flaminio Vacca in 1594, No 23) the tanks came from the
Baths of Caracalla. The first was found during the pontificate of
Pope Paul II, and from these it was brought to Piazza San Marco, to adorn its
Palazzo di Venezia. The second was found under Paul III and made by them here, adorning his palace. On the origin of the two granite tanks, however, the debate is long and unfinished After
Pope Paul V had led the
Aqueducts in Rome to
Trastevere and also, bypassing the
Tiber, to the Rule, and
Gregory XV had granted 40 ounces to the Farnese for the feeding of the fountains, the family acquired the fountain of Piazza San Marco and commissioned
Girolamo Rainaldi, around 1626, to draw the two fountains in which the two pools were located. The
fountains were purely ornamental and surrounded by a gate. For the benefit of the people (and also of the animals), the fountain of the Mascherone was erected at the beginning of
via Giulia. ==Buildings on the square==