For a variety of social and political factors the Zoroastrians of the Indian subcontinent, namely the Parsis and Iranis have not engaged in conversion since at least the 18th Century. Zoroastrian high priests, have historically opined there is no reason to not allow conversion which is also supported the Revayats and other scripture though later priests have condemned these judgements. Within Iran, many of the beleaguered Zoroastrians have been also historically opposed or not practically concerned with the matter of conversion. Currently though, The Council of Tehran Mobeds (the highest ecclesastical authority within Iran) endorses conversion but conversion from Islam to Zoroastrianism is illegal under the laws of the Islamic Republic of Iran.