|Titular Archbishop of Tarsus; Cardinal priest of Sant'Eusebio|
|See||Prefect of the Sacred Congregation of the Council|
|Installed||September 15, 1841 — April 23, 1847|
|Other posts||Previously Prefect of the Sacred Congregationn of the Religious Discipline|
|Created Cardinal||June 23, 1834|
January 4, 1778|
Iesi, Marche, Italy
|Died||April 23, 1847
He was ordained priest in 1800 and became vicar general of Viterbo and later of the suburbicarian diocese of Ostia. Arrested and exiled until 1814 during the French occupation of Rome and then continued his eclessiastical career in the Roman Curia and became Secretary of Sacred Congregation of the Council and also was appointed Secretary of the conclaves of 1829 and 1830-1831.
Polidori was created cardinal priest in the consistory of June 23, 1834 by Pope Gregory XVI with the title of Sant'Eusebio. He was made Prefect of the Sacred Congregationn of the Religious Discipline on November 21, 1834. Opted for the title of Santa Prassede on July 12, 1841 after suppressing the Sant'Eusebio title in 1839. Appointed Prefect of the Sacred Congregation of the Council on September 15, 1841 until his death.