Monumentum Altar from the Mitreo sotto la Basilica di San Lorenzo This cylindrical marble altar was dedicated by the same Pater Proficentius as the slab, both monuments found in the Mithraeum beneath the Basilica of San Lorenzo. The New Mithraeum26 Jan 2022Updated on 26 Aug 2023 The full article is reserved for our members. Log in or create a free account to access the entire site.Cylindrical marble altar upon a square base (H. 0.725 Br. 0.40 base; diam. 0.41). This altar which was already restored in antiquity, has an inscription in a tabula: L.H. 0.035-0.04 Aebutius Restituti/anus qui et Proficen/tius antistes dei / Solis invicti Mithrae/ aram / d(onum) d(edit). After the last words a palm-branch. Nogara-Magi, 230 and PI. XII, 1; Nogara in Quaderni, PI. I, a.