He took a leading part in the discussions which led up to the promulgation of the dogma of the Immaculate Conception (1854), and from 1869 was prominent on the Ultramontane side in the Vatican Council.
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From Ferrara, where he was rector of the Jesuit College after 1830, he returned to his teaching work in Rome, being made head of his old college in 1850.
Then four years were passed in the study of theology, under the professors such as Giovanni Perrone and Carlo Passaglia.
Don Giovanni | Giovanni Pierluigi da Palestrina | Giovanni Bellini | Giovanni Riggi | Giovanni Boccaccio | Giovanni Battista Pergolesi | Giovanni Battista Tiepolo | Giovanni Battista Guarini | Giovanni | Giovanni Trapattoni | Giovanni "John the Eagle" Riggi | Giovanni Gabrieli | Giovanni Falcone | Villa San Giovanni | San Giovanni in Persiceto | Giovanni Verga | Giovanni van Bronckhorst | Giovanni Tamagno | Giovanni Pacini | Giovanni Battista Pescetti | Giovanni Papini | Giovanni Hidalgo | Giovanni Domenico Cassini | Giovanni de' Medici | Giovanni Bottesini | Giovanni Battista Riccioli | Giovanni Zenatello | Giovanni Visconti | Giovanni Schiaparelli | Giovanni Pisano |
It is an explanation of the doctrine of Infallibility as taught by the Italian "Ultramontane" theologians, such as Bellarmine in the sixteenth century, Pietro Ballerini in the eighteenth century and Giovanni Perrone in the nineteenth century.