of St. Peter's Basilica. According to Rev. William Roberts, Alexander VII wrote one of the most authoritative documents related to the heliocentrism issue. However, the document is not about any astronomic model and is not part of the Magisterium Ecclesiae. The Pope published his Index Librorum Prohibitorum Alexandri VII Pontificis Maximi jussu editus which presented anew the contents of the Index of Forbidden Books which had condemned many works related to many different matters: among them were the works of Copernicus and Galileo. He prefaced this with the bull Speculatores Domus Israel (1592), stating his reasons: "in order that the whole history of each case may be known." 'For this purpose,' the Pontiff stated, 'we have caused the Tridentine and Clementine Indices to be added to this general Index, and also all the relevant decrees up to the present time, that have been issued since the Index of our predecessor Clement, that nothing profitable to the faithful interested in such matters might seem omitted." Among those included were the previous decrees placing various heliocentric works on the Index ("...which we will should be considered as though it were inserted in these presents, together with all, and singular, the things contained therein...") and, according to Roberts, using his Apostolic authority he bound the faithful to its contents ("...and approve with Apostolic authority by the tenor of these presents, and: command and enjoin all persons everywhere to yield this Index a constant and complete obedience...") Thus, for the geocentrists, Alexander turned definitively against the heliocentric view of the solar system. After Alexander VII's pontificate, the Index underwent a number of revisions. "In 1758 the general prohibition against works advocating heliocentrism was removed from the Index of prohibited books, although the specific ban on uncensored versions of the Dialogue and Copernicus's De Revolutionibus remained. All traces of official opposition to heliocentrism by the church disappeared in 1835 when these works were finally dropped from the Index". The Index was abolished entirely in 1966. Theology Alexander VII's Apostolic Constitution, Sollicitudo omnium ecclesiarum (8 December 1661), laid out the doctrine of the Immaculate Conception of the Blessed Virgin Mary in terms almost identical to those utilized by Pope Pius IX when he issued his infallible definition Ineffabilis Deus. Pius IX cites Alexander VII's bull in his footnote 11. Morality On 18 March 1666 in a decree issued, Alexander VII issued a correction on various moral