W. J. Phythian-Adams has written:

'Mithraism' -- subject(s): Mithraism

Judahism was developed by Abraham

Roger Beck has written:

'A brief history of ancient astrology' -- subject(s): Astrology, History

'Mithraism since Franz Cumont' -- subject(s): Mithraism

Yes. Mithraism was a strong competitor to Christianity in the first two centuries, but had a fatal weakness, whatever its theological truth. Mithraism only accepted men as full members, whereas Christianity actively sought out women as converts, knowing that if the wives converted to Christianity, men would often follow.

Mithraism was not an imperial cult, it was a military one. It thrived under several emperors. We know little about it as its rites were secret. We do know that it originated in ancient Persia and that the god Mithras was always seen killing a bull.