Gratianopolis was an ancient city and Roman Catholic diocese in Mauretania Caesariensis in present-day Algeria.
It was one of several towns named after the Roman emperor Gratian (367 to 383), and is only known from mentions in church council minutes.
Gratianopolis was important enough in the Roman province of Mauretania Caesariensis to become the seat of the Catholic bishop.
[1] From 1652, the diocese was restored as a Catholic titular bishopric of Gratianopolis.
The following people were given the title, Bishop of Gratianopolis:[2] This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed.