After his ordination to the priesthood, Angelis was raised to the rank of Domestic Prelate and served as a professor at his alma mater of the Pontifical Academy of Ecclesiastical Nobles for many years. He was made a canon of the Liberian Basilica as well.
On July 6, 1826, Angelis was appointed Coadjutor Bishop of Montefiascone and Titular Bishop of Leuce by Pope Leo XII. He received his episcopal consecration on the following July 23 from Pietro Cardinal Galleffi, with Archbishops Giuseppe della Porta Rodiani and Giovanni Sinibaldi serving as co-consecrators, in the church of Ss. Trinita a Montecitorio. In 1830 Angelis was promoted to Titular Archbishop of Cartagine on March 15, and later named Nuncio to Switzerland on April 23. He was also named Nuncio to Portugal on November 13, 1832, but remained in Switzerland until April 1839 and never occupied the post in Portugal because its diplomatic relations with the Vatican were terminated shortly after his appointment.
Angelis was appointed Bishop of Montefiascone, with the personal title of "Archbishop," on February 15, 1838. Pope Gregory XVI secretly, or in pectore, elevated him to the College of Cardinals in the consistory of the following September 13, eventually publishing him as Cardinal Priest of S. Bernardo alle Terme. He was made Archbishop of Fermo on January 27, 1842, and later participated in the papal conclave of 1846, which selected Pope Pius IX.
On September 20, 1867, Angelis was named Chamberlain of the Holy Roman Church, or Camerlengo. He opted for the titular church of S. Lorenzo in Lucina on that same date as well. Becoming Cardinal Protopriest (the longest-serving member of the order of Cardinal Priests) on the following December 4, Angelis attended the First Vatican Council (1868-1870), of which he was made chief presiding officer on December 30, 1869.
The Cardinal died in Fermo at 7 a.m., at the age of 85. He is buried in Fermo as well.
[[Category:Bishops of Montefiascone]
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