Monumentum Inscription by Propinquos of Carnuntum On this slab, Gaius Iulius Propinquos indicates that he made a wall of the Mithraeum at his own expense. The New Mithraeum4 Feb 2022 The full article is reserved for our members. Log in or create a free account to access the entire site. Slab with inscription of Gaius Iulius Propinquos indicating that he paid to build one or two walls of the Mithraeum III of Carnuntum.