ÃÂdurfarrà Âbay ë FarroxzÃÂdÃÂn was a 9th-century Zoroastrian high-priest who served as the leader of the Zoroastrian community of Fars in Iran. His first name has the meaning 'The (Sacred) Fire Farrà Âbay', the Farrà Âbay fire being one of the three preeminent ÃÂdurs of Iran. He was the son of a certain FarroxzÃÂd, and is known to have held a religious disputation in 825 at the Abbasid court with the former Zoroastrian turned Manichaean named AbÃÂlià ¡ / AbdallÃÂh, called "an apostate", with the former Iranian name DÃÂn-Ohrmazd. ÃÂdurfarrà Âbay managed to win the debate and AbdallÃÂh was removed from the Abbasid court.
ÃÂdurfarrà Âbay is also known to have written the DÃÂnkard, an Encyclopedia about Zoroastrian beliefs and customs. He also compiled an ÃÂvÃÂn-nÃÂmag 'Book of Customs' on the tenets of the Zoroastrian religion. The fourth Book of DÃÂnkard is regarded as a condensed version of this work.
ÃÂdurfarrà Âbay was later succeeded by his son Zarduà ¡t. He also had another son named JuvÃÂnjam, who, like his father, would later have a distinguished career. Another Zoroastrian high-priest named ÃÂdurbÃÂd ë EmÃÂdÃÂn would later edit the DÃÂnkard, putting much more information about Zoroastrian beliefs and customs. ÃÂdurfarrà Âbay was also the ancestor of the prominent Zoroastrian Manuà ¡cihr ë JuvÃÂnjam, who wrote the DÃÂdestÃÂn ë DÃÂnëg.