Giacomo Cantelmo was born in Naples on June 13, 1645, the son of Filippo Cantelmo, duke of Popoli and prince of Pettorano, and Beatrice Brancia, duchess of Padula. The family's surname is sometimes given as Cantelmo-Stuart because of they were related to James II of England.
On September 27, 1683, he was elected Titular Archbishop of Caesarea. He was consecrated as a bishop by Cardinal Carlo Pio, Titular Bishop of Sabina, on October 3, 1683. He became nuncio to Vienna in 1683. He then served as nuncio to Switzerland from April 18, 1685 to December 10, 1687. On October 23, 1688, he was named nuncio extraordinary to Poland. He became nuncio extraordinary to Austria on October 25, 1689. He then returned to Rome to become secretary of the Sacred Congregation for Bishops and Regulars.
In the consistory held on February 13, 1690, Pope Alexander VIII created him a cardinal priest. On April 10, 1690, he attended Joseph's coronation as King of the Romans; on the same day, he received the red hat, was awarded the titular church of Santi Marcellino e Pietro al Laterano, and named papal legate to Urbino. He was transferred to the metropolitan see of Capua on September 27, 1690, receiving the pallium on December 11, 1690.
He participated in the papal conclave of 1691, which elected Pope Innocent XII. The new pope transferred him to the metropolitan see of Naples, with Cantelmo receiving the pallium on August 8, 1691. There, he held a diocesan synod on Pentecost 1694. He also convened a provincial synod, attended by 13 bishops, and opened on June 7, 1699.
He participated in the papal conclave of 1700, which elected Pope Clement XI. The new pope named him Camerlengo of the Sacred College of Cardinals, with Cantelmo serving from February 3, 1700 to January 23, 1702.
He died in Naples on December 11, 1702.
|Catholic Church titles|
|Camerlengo of the Sacred College of Cardinals
Toussaint de Forbin-Janson