Your search Firmicus Maternus gave 2 results.
Mithras the Cattle-Rustler: The Persian Cult of Fire as Divided into Sexed Powers and the Hidden Cave Rites of the Magi.
Votive sandstone altar from Wiesbaden, ancient Aquae Mattiacae, dedicated to Deo Soli invicto by Caius Silvinius Maternus, in honour of the Domus Divina