Tuscamia was an ancient Roman-Berber civitas in the province of Mauretania Caesariensis. The town is known from late antiquity as flourishing through the Vandal Kingdom and Roman Empire, and possibly through the Muslim conquest of the Maghreb. The exact location of the ancient town is now lost to history,Tuscamia at gcatholic.org]. but it was somewhere in today's Algeria.

Bishopric Tuscamia, was also the seat of an ancient CatholicTuscamia at catholic-hierarchy.org. bishopric.Joseph Bingham, Origines Ecclesiasticae: Or, The Antiquities of the Christian ..., Volume 3 (William Straker and J. H. Parker, 1840) p232.Antoine Godeau, Algemeine Kirchengeschichte: Enthält die Kirchengeschichte des vierten (Rieger, 1771 ) p66. The only known bishop of this African diocese is Massimo, who took part in the synod assembled in Carthage in 484 by the Arian King Huneric the Vandal, after which Massimo was exiled.Pius Bonifacius Gams, Series episcoporum Ecclesiae Catholicae, (Leipzig, 1931), p. 469.Stefano Antonio Morcelli, Africa christiana, Volume I, (Brescia, 1816), p. 341.

Today Tuscamia survives as titular see of the Roman Catholic Church and the current bishop is Antônio Augusto Dias Duarte, auxiliary bishop of Rio de Janeiro.Le Petit Episcopologe, Issue 178, Number 14,833. Guido Del MestriHarris M. Lentz III, Popes and Cardinals of the 20th Century: A Biographical Dictionary (McFarland, 23 Mar. 2009 ) p60. and Filippo Santoro were both long-term bishops of the diocese in the 20th century.

See also Mauretania Caesariensis

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