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The l. side of the altar is decorated with a tympanum against a pedum under which a large altar. On the r. side an altar with a thyrsus and erotala. The front bears an inscription:
Deae Semelae et / sororibus eiuis (sic!) / deabus ob honorem / sacri matratus / Reginia fraterna / mater nata et facta aram po/suit sub sacerdota[e] Seranio Catullo patre.
patre: certainly the father of a Mithras community which had relations with a cult for women with a mater.