Ressiana is an ancient Roman city of the province of Numidia in present in what is now Algeria and a smaller part of Tunisia, North Africa. The city was the seat of a bishopric, which exists now only as a titular see. Bishop Franc Šuštar, auxiliary bishop of Ljubljana is the current titular bishop.
Bishops 1948–2003 Adalbert Boros 2003–2008 John Michael Quinn 2008–2015 Jean-Pierre Batut since 2015 Franc Šuštar
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