Final answer:
The cult of Isis and Osiris was a religious practice of the ancient Egyptians. Originating in Egypt, the cult spread to the western Roman Empire in the first century BCE.
Step-by-step explanation:
The cult of Isis and Osiris was a religious practice of the ancient Egyptians. Originating in Egypt, the cult spread to the western Roman Empire in the first century BCE. The veneration of Isis included hymns of praise and initiation rituals, and priests of the cult usually shaved their heads. The exclusive worship of Isis was reflected in her perceived omnipotence and identification with other gods. The popularity of mystery cults, like the cult of Isis, may have been a precursor to monotheism in Rome, as seen in the rise of Christianity.