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3000 BCE - 800 BCE: Possible development of the concept of Ahriman in Early Iranian Religion.
1500 BCE - 1000 BCE: Development of Ahriman in religion of Zoroastrianism.
550 BCE - 330 BCE: Ahriman further developed during the Achaemenid Empire.
550 BCE - 330 BCE: Zorvanism develops at some point during the latter part of the Achaemenid Empire; Ahriman now seen as twin brother of Supreme God Ahura Mazda.
224 CE - 651 CE: Zoroastrian texts containing tales of Ahriman written down during the Sassanian Empire, preserving his character and legacy to later religions.