Zoroastrianism

Groups the spreadevent entries documenting Zoroastrianism's spread as the state religion of successive Persian empires, its geographic reach across the Iranian plateau and beyond under Achaemenid, Parthian and Sasanian rule, and its later contraction and diaspora migration, notably the Parsi community's settlement in India. Belongs here: any event marking Zoroastrianism's geographic, political or diaspora expansion into a new region. Does not belong here: its own founding and doctrinal-formation events; the spread events of any other tradition.