Mithraism is a cult dedicated to the worship of the god Mithras, sometimes called Mitra. There are two different organizations that fall under this term. There is an eastern version, which involved the gods Mitra, Ahur Mazda, and others, this may simply be Zoroastrianism or a variation of it. Then there is Roman Mithraism, which is a cult that was most active in the first centuries AD. Roman Mithraism may have been a romanized version of Persian Mitra worship, or it may have been a new creation that built upon the stories of Mitra, but was no continuous with the Persian mithraists.