The worship of Egyptian deity that rivaled Christianity as a popular religion throughout the Roman Empire is Isis.
Isis was a fertility goddess in ancient Egypt who was also associated with magic, motherhood, death, healing, and rebirth. Isis was the first child of Geb and Nut, the god and goddess of the ground and the sky, respectively. Osiris, who subsequently became her husband as well, had a sister named Isis. Horus was Isis and Osiris' son.
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