The God of Light according to Zoroastrianism. Ahuramazda is the God of Good in Zoroastrian thinking. Ahuramazda will eventually triumph over the God of Evil, and exact judgment upon the people of the Earth. Only those who have chosen a righteous path will be allowed to pass into everlasting peace and happiness. Darius, the Great King of Persia, was known to be a believer in Ahuramazda.