In 1660 inscriptions were placed in the new transept chapels above the side doors that named the two nephews of the pope as founders although the rebuilding of the transept was conceived by the Pope Alexander VII himself and the costs were paid directly by the Apostolic Camera. The Altar of the Holy Family belonged to Flavio Chigi, who was Cardinal-Priest of Santa Maria del Popolo at the time and Cardinal-Nephew of the pope. The Altar of the Visitation belonged to Agostino Chigi, the Prince of Farnese. The chalice on the Holy Family painting alludes to priesthood, the vocation of the cardinal, while the theme of the Visitation is strongly connected to fertility, something that was expected of the prince who married Maria Virginia Borghese in 1658, the date on the inscriptions, and founded the Roman branch of the Chigi dynasty.