Noun
Zurvanism (uncountable)
(religion, historical) A now-extinct branch of Zoroastrianism that had the divinity Zurvan as its primordial creator deity.
Conversely, an extinct and unorthodox branch of Zoroastrianism called Zurvanism viewed Ahriman and Ahura Mazda as twins subservient to a morally neutral God who embodied Infinite Time, called Zurvan, and may likewise be considered henotheistic. Source: Internet
Following Haug, the Bombay Parsis began to defend themselves in the English language press; the argument being that Angra Mainyu was not Mazda's binary opposite, but his subordinate, who—as in Zurvanism also—chose to be evil. Source: Internet
Other than Zurvanism, the Sassanian kings demonstrated their devotion to Ahura Mazda in other fashions. Source: Internet