Thimida Regia is a former Roman city of the Roman province of Byzacena in North Africa (modern Tunisia). The town was the episcopal see of an ancient Christian diocese which flourished until the arrival of Arab armies in the 640s. That diocese survives today only as a Latin Church titular see of the Catholic Church,Thimida Regia at Catholic-Hierarchy.org.Annuario Pontificio 2013 (Libreria Editrice Vaticana 2013 ). and has effectively ceased to function.Eintrag in catholic-hierarchy.org (English)Apostolische Nachfolge – TitularsitzeEintrag auf gcatholic.org (English) The current bishop is Dominic Nguyên Tuan Anh auxiliary bishop of Roman Catholic Diocese of Xuân Lộc.
The ancient town is identified with ruins at 36.640739n, 10.141835e,R. B. Hitchner, R. Warner, R. Talbert, T. Elliott, and S. Gillies, 'Thimida Regia: a Pleiades place resource', Pleiades: A Gazetteer of Past Places, 2012. south of the modern town of Tunis.
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