Career
He served as papal nuncio to Turin from 1778 until he was made archbishop of Ravenna on 8 May 1785. He pushed for the Peace of Tolentino in 1797 and played a role in the consulte de Lyon in 1802. When Napoleon I made himself king of Italy, he made Codronchi grand-almoner, senator and grand-dignitary of the Order of the Iron Crown.
After Napoleon"s fall, he backed the Bourbons.