Irano-Aryan faith and doctrine as contained in the Zend Avesta

"The written text of the Zend-Avesta is to be referred to the reign of Ardeshir Babegan, originally a Persian officer of royal descent, who, serving in the army of Artaban the Parthian, revolted, and succeeded in relieving Persia of the Parthian yoke, and re-establishing the ancient Empire, about 226 years after Christ."