Byzacena (or Byzacium) (, Byzakion) was a Late Roman province in the central part of Roman North Africa, which is now roughly Tunisia, split off from Africa Proconsularis. History At the end of the 3rd 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 to its adjacent south, and Tripolitania to its adjacent south, roughly corresponding to southeast Tunisia and northwest Libya. Byzacena corresponded roughly to eastern Tunisia or 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. Episcopal sees Ancient episcopal sees of Byzacena listed in the Annuario Pontificio as titular sees: Abaradira Abari Abidda (ruins of Ksour-Abbeda) Acholla (Henchir-El-Alia) Aeliae (Henchir-Mraba? Henchir-Merelma) Africa (Mahdia) Afufenia Aggar Aggersel (Abd-Er-Rahman-El-Garis? Tacrouna?) Ammaedara (Haïdra) Amudarsa (in the plain of Saïda) Ancusa Aquae Albae in Byzacena (in Gabès Governorate) Aquae in Byzacena (in Gabès Governorate) Aquae Regiae (Henchir-Baboucha?) Aurusuliana (in the territory of Henchir-Guennara) Ausafa Autenti Auzegera Bahanna (Henchir-Nebahna, ruins at Dhorbania?) Bararus (Henchir-Ronga, Rougga) Bassiana Bavagaliana Bennefa (Oglet-Khefifa) Bladia (Henchir-Baldia?) Buleliana Cabarasussi (Drâa-Bellouan) Carcabia Cariana Cebarades Cenculiana Cercina (Kerkennah Islands) Cibaliana Cillium alias Colonia Cillilana (Kasserine) Crepedula Cufruta Chusira (Kessera) Decoriana Dices (Henchir-Sidi-Salah, Sadic?) Dionysiana Drua (Henchir-Bou-Driès) Dura (Titular See) Edistiana Egnatia Febiana Feradi Maius (Henchir-El-Ferada?) Feradi Minus Filaca Fissiana (in the plain of Foussana?) Foratiana Forontoniana (Henchir-Bir-El-Menadka?) Gaguari Garriana (Henchir-El-Garra) Gemellae in Byzacena (Sidi-Aïch) Germaniciana (ruins of Ksour-El-Maïeta? Melloul? ruins of Hadjeh-El-Aïoun?) Gratiana Gubaliana (ruins of Djebeliana? ruins of Henchir-Goubel?) Gummi in Byzacena (Henchir-Gelama?, Henchir-El-Senem) Gurza (Kalâa Kebira) Hadrumetum (Sousse), the Metropolitan Archbishopric Hermiana Hierpiniana Hirina Horrea Coelia (Hergla) Iubaltiana (at Kairouan) Iunca in Byzacena (Ounga) Leptiminus Limisa (Henchir-Boudja) Macon Macriana Maior Macriana Minor Mactaris Madarsuma (Henchir-Bou-Doukhane?) Maraguia (ruins of Ksar-Margui?) Marazanae (Henchir-Guennara) Marazanae Regiae Masclianae (ruins of Hadjeb-El-Aioun?) Materiana Maximiana in Byzacena (near Sousse) Mediana (Bishopric) Menefessi (Henchir-Djemmiah) Mibiarca Midica (near Sfax) Mididi (Henchir-Medded, Midid) Mimiana Mozotcori Munatiana Mutia (Henchir-El-Gheria, Henchir-Furna) Muzuca in Byzacena (Henchir-Besra) Nara (Bir El Hafey) Nationa Nepte (Nafta) Octaba Octabia Pederodiana (Oum-Federa, Fodra?) Precausa Praesidium (Somâa) Putia in Byzacena (Bir-Abdallah?) Quaestoriana Rufiniana Ruspae Rusticiana Sassura (Henchir