Tiddis was a Roman city that depended on Cirta and a bishopric as Tiddi, which remains a Latin Catholic titular see. It was located on the territory of the current commune of Bni Hamden in the Constantine Province of eastern Algeria.
This second relief depicting a phallus from Tiddis, Algeria, has been positioned alongside its counterpart atop pillars that greet visitors to the Mithras shrine.
