Kasiani wa Tanja alikuwa Mkristo wa Moroko aliyefia dini yake kwa kukatwa kichwa katika dhuluma ya kaisari Dioklesyano. Tarehe inayotajwa na mapokeo ni 3 Desemba 298. Tangu kale anaheshimiwa na Wakatoliki na Waorthodoksi kama mtakatifu mfiadini. Sikukuu yake huadhimishwa tarehe 3 Desemba. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko Geoffrey Ernest Maurice de Sainte-Croix, Christian Persecution, Martyrdom, and Orthodoxy, Oxford University Press, 2006, p. 172:"we must admit that we know nothing of the date or the circumstances of his execution" http://www.santiebeati.it/dettaglio/80250 Martyrologium Romanum https://catholicsaints.info/saint-cassian-of-tangiers/ Vincent J. O'Malley, Saints of Africa, ed. Our Sunday Visitor Publishing, 2001, p. 164 [1]