Byzacena was a Roman province in what is now Tunisia.
At the end of the third century AD, the Roman Emperor Diocletian divided the great Roman province of Africa Proconsularis into three smaller provinces: Zeugitana in the north, still governed by a proconsul and referred to as Proconsularis, Byzacena, and Tripolitania in the south. It corresponded roughly to the modern Tunisian region of Sahel.
Hadrumetum (modern Sousse) became the capital of the newly made province, whose governor had the rank of consularis. At this period the Metropolitan Archbishopric of Byzacena was, after the great metropolis Carthage, the most important city in Roman (North) Africa west of Egypt and its Patriarch of Alexandria.
Ancient episcopal sees of Byzacena listed in the Annuario Pontificio as titular sees:
AbaradiraAbariAbidda (ruins of Ksour-Abbeda)Acholla (Henchir-El-Alia)Aeliae (Henchir-Mraba? Henchir-Merelma)* Africa (Mahdia)AfufeniaAggarAggersel (Abd-Er-Rahman-El-Garis? Tacrouna?)Ammaedara (Haïdra)Amudarsa (in the plain of Saïda)AncusaAquae Albae in Byzacena (in Gabès Governorate)Aquae in Byzacena (in Gabès Governorate)Aquae Regiae (Henchir-Baboucha?)Aurusuliana (in the territory of Henchir-Guennara)AusafaAutentiAuzegeraBahanna (Henchir-Nebahna, ruins at Dhorbania?)Bararus (Henchir-Ronga, Rougga)BassianaBavagalianaBennefa (Oglet-Khefifa)Bladia (Henchir-Baldia?)BulelianaCabarasussi (Drâa-Bellouan)CarcabiaCarianaCebaradesCenculianaCercina (Kerkennah Islands)CibalianaCillium alias Colonia Cillilana (Kasserine)CrepedulaCufrutaChusira (Kessera)DecorianaDices (Henchir-Sidi-Salah, Sadic?)DionysianaDrua (Henchir-Bou-Driès)DuraEdistianaEgnatiaFebianaFeradi Maius (Henchir-El-Ferada?)Feradi MinusFilacaFissiana (in the plain of Foussana?)ForatianaForontoniana (Henchir-Bir-El-Menadka?)GaguariGarriana (Henchir-El-Garra)Gemellae in Byzacena (Sidi-Aïch)Germaniciana (ruins of Ksour-El-Maïeta? Melloul? ruins of Hadjeh-El-Aïoun?)GratianaGubaliana (ruins of Djebeliana? ruins of Henchir-Goubel?)Gummi in Byzacena (Henchir-Gelama?, Henchir-El-Senem)Gurza (Kalâa Kebira)Hadrumetum (Sousse), the Metropolitan ArchbishopricHermianaHierpinianaHirinaHorrea Coelia (Hergla)Iubaltiana (at Kairouan)Iunca in Byzacena (Ounga)LeptiminusLimisa (Henchir-Boudja)MaconMacriana MaiorMacriana MinorMactarisMadarsuma (Henchir-Bou-Doukhane?)Maraguia (ruins of Ksar-Margui?)Marazanae (Henchir-Guennara)Marazanae RegiaeMasclianae (ruins of Hadjeb-El-Aioun?)MaterianaMaximiana in Byzacena (near Sousse)MedianaMenefessi (Henchir-Djemmiah)MibiarcaMidica (near Sfax)Mididi (Henchir-Medded, Midid)MimianaMozotcoriMunatianaMutia (Henchir-El-Gheria, Henchir-Furna)Muzuca in Byzacena (Henchir-Besra)Nara (Bir El Hafey)NationaNepte (Nafta)OctabaPederodiana (Oum-Federa, Fodra?)PrecausaPraesidiumPutia in Byzacena (Bir-Abdallah?)QuaestorianaRufinianaRuspaeRusticianaSassura (Henchir Es-Zaouadi)ScebatianaSegermesSelendetaSeptimunicia (ruins of Oglet-El-Metnem? Henchir-El-Bliaa?)SeverianaSufesSufetulaSulianaSullectum (Salacia)Tabalta (Henchir-Gourghebi?)Tagarbala (Bordj-Tamra, Tamera)TagariaTagaseTalaptulaTamalluma (Oasis of Telmin)TamataTamazeniTambeae (in the region of Aïn-Beida and Henchir-Baboucha)TanudaiaTaparuraTaraqua (Ksour-El-Khaoua?)Tarasa in Byzacena (near Djebel-Trozza?)Temuniana (Henchir-Temounia?)TetciThagamuta (in the plain of Guemouda?)ThalaThapsusThasbalta (in the valley of Segui?)ThelepteThenae (Henchir-Tina)TheuziThiges (Bordj-Gourbata)Thucca Terenbenthina (Henchir Dougga)ThysdrusTigias (Henchir-Taus, in the oasis of Kriz)TigualaTrofimianaTubulbaca (Teboulba?)TurrisblandaTurres in Byzacena (ruins of Tamarza? ruins of Msilica?)Turris Tamalleni (ruins of Oum-Es-Samâa)TusurosUnizibira (Henchir-Zembra?)UsulaUzitaValentinianaVartana (Srâa-Ouartane)VassinassaVegesela in Byzacena (Henchir-Recba)VibianaVicus Aterii (Bir el Ater)VictorianaVicus Augusti (ruins of Sidi El Hani, Henchir-Sabra?)Vita (ruins of Beni-Derraj?)Zella (Zaouila, suburb of Mahdia? ruins of Zellez?)
