He was born the third of five children to Antonio and Anna Maria Lang. His family was linked to the ancient aristocratic family of the Orsini. His parents initially wanted him to study law, but in 1835, Ignazio abandoned the Collegio Nazareno, where he had enrolled in 1828, and attended the Accademia di San Luca in Rome.
Biography
By 1850, he had a studio in Piazza Barberini, just below where he lived, where he sculpted the statue of Bacio di Giuda, commissioned by the painter Tommaso Minardi, professor in the Accademia di San Luca. When Pope Pius IX visited the studio in August 1852, he decided to acquire the sculpture and place it on December 6, 1855, flanking the atrium at the base of the Scala Santa at San Giovanni in Laterano. In 1854, the secretary of the Papal state, Giovanni Antonelli, commissioned the statuary group of Ecce Homo, which now stands across from the Bacio group. Ignazio completed a statue of Moses for the Column of the Immacolata that was erected in 1856 in front of the palace of Propaganda Fide in Piazza di Spagna. It is on one of the four pedestals upholding the column, along with statues of David, Ezekiel, and Isaiah. In 1857, he completed the stucco model of the Depostion; a marble counterpart was never completed. In the Basilica of San Paolo fuori le Mura, which had been recently been rebuilt after a fire in 1823, Jacometti completed the angels that hold the heraldic shield of Pius IX that found over the entrance doorway. The shield was carved by Giovanni Meli. He also made the statue of St Peter at the end of the nave, flanking the entrance to the tomb of Paul. Revelli completed the paired St Paul with the sword inside the church. He also completed numerous funereal and other monuments. Among those are the monuments for:
Count Luigi Pelagallo in San Bartolomeo della Pietà a Fermo
Design for Monument to the Immaculate Conception'' was commissioned for Dublin in 1881.
In 1855, he was resident professor of the Accademia di San Luca, and in 1861 became consigliere or the institute, and in 1863, secretary of the academic council. In 1870, he was nominated director of the Papal Galleries and Museums, and was influential in compiling an inventory of the possessions. In the year, Pius IX named him knight, then commendatore of the Order of San Gregorio. In 1879 he was president of the Academy of St. Luke for a year. His son, Francesco, published a biography of his life.
