Castellum Iabar was an ancient Roman-Berber civitas in the province of Mauretania Caesariensis. The town was also the seat of a Catholic Church diocese.Toulotte, Anatole (1852-1907), Morcelli, Stefano Antonio, Géographie de l'Afrique chrétienne. (Impr. de Notre-Dame des Prés) ((Montreuil-sur-Mer), 1892-1894), p14. Die Apostolische Nachfolge , from Annuario Pontificio 1869 - 19.06.2017.
An exact location of the ancient town is not currently known.Castellum Iabar at gcatholic.org. It has been tentatively linked with the Kalaat fortress near Tiaret, Algeria.Eduard Bocking, Notitia dignitatum et administrationum omnium tam civilium quam militarium .(impensis Adolphi Marci, 1839 ) p392. Tiaret is also identified with the Roman town of Tingartia.
The ancient Bishopric survives today as a titular see of the Roman Catholic Church.Castellum Iabar at Catholic hierarchy.org. and the current bishop is João Miranda Teixeira.
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