Noun
Mithraeum (plural Mithraea or Mithraeums)
A grotto where the god Mithra was worshipped.
A mosaic in the Ostia Mithraeum of Felicissimus depicts these grades, with symbolic emblems that are connected either to the grades or are just symbols of the planets. Source: Internet
For their feasts, Mithraic initiates reclined on stone benches arranged along the longer sides of the Mithraeum – typically there might be room for 15 to 30 diners, but very rarely many more than 40 men. Source: Internet
Temples to Mithras also exist in military contexts at Vindobala on Hadrian's Wall (the Rudchester Mithraeum ) and at Segontium in Roman Wales (the Caernarfon Mithraeum ). Source: Internet
Clauss, M., The Roman cult of Mithras, pp. 31 32. It cannot be shown that any Mithraeum continued in use in the 5th century. Source: Internet
It is known that intitates could transfer with their grades from one Mithraeum to another. Source: Internet
Some scholars maintain that practice may have differed over time, or from one Mithraeum to another. Source: Internet