The religion of the Ahl-i-Haqq ("Devotees of Truth") is also closely associated with Kurdistan. It first emerged among the Guran of southern Kurdistan or in neighbouring Luristan, and its most sacred writings are all in the Gurani language.
Unlike the Yezidi religion, however, it spread from Kurdistan to neighbouring areas and found followers among the Lur, the Azerbaijani Turks, the Persians in Iran and the Turcomans in Iraq. The French philosopher, the Comte de Gobineau, who spent several years in Iran in the mid-nineteenth century, was the first westerner to write extensively on this religion, which he considered as "the most important religion of Persia, be it for its dogmas, for the number of its adherents, or for their quality."
Among the Kurds the Ahl-i-Haqq religion has at present followers in four distinct areas. The most important of these is the region west of Kirmanshah near the Iraqi border. This is where the Guran live now and where we also find the major shrines of the Ahl-i-Haqq. A second zone of concentration is the Sahne district between Kirmanshah and Hamadan. Many of the Lur who live to the south of these two Kurdish Ahl-i-Haqq areas are also followers of this religion, and it is quite possible that in the past a significant portion of the inhabitants of the entire region were Ahl-i-Haqq. The third area consists of a string of Kurdish and Turcoman villages south of Kirkuk in Iraq, where the religion and its followers are called Kaka'i. The fourth consists of a cluster of villages near Mosul; this community goes by the name of Sarli. I do not dare to make an estimate as to the number of Ahl-i-Haqq among the Kurds. In the Guran district west of Kirmanshah, which I know best, they number in the tens of thousands. A recent study estimates the total number of all Ahl-i-Haqq at half a million, but most of these are not Kurds.
The Ahl-i-Haqq believe that God and six or seven archangels, who represent various aspects of God's essence, have manifested themselves several times in the world in human form. One of these human incarnations of God himself was, according to their belief, Ali, the cousin and son-in-law of the Prophet Muhammad. The belief in Ali's divine nature is shared by a number of other Middle Eastern sects of extremist Shiite (ghulat) origin, such as the Nusayris (Alawis) in Syria and the Qizilbash (Alevis) in Turkey. Their more orthodox neighbours often lump these sects together under the nickname "Ali-Ilahis." To the Ahl-iHaqq, however God's most important incarnation was not Ali but Sultan Sahak, the reputed founder of their sect. The Ahl-i Haqq also attach more importance than other ghulat sects to the archangels accompanying the deity in all his manifestations, known together as the Haft Tan, the Seven Persons. This resembles the Yezidi belief in seven angels who were incarnate in seven saints; and it is of course reminiscent of the seven "Bounteous Immortals" (amesha spenta), angelic beings who play a similar part in Zoroastrian doctrine. Like the Yezidis too, the Ahl-i-Haqq believe in reincarnation of the ordinary human soul. Religious leadership is hereditary and exercised by a number of sayyid families descending from Ahl-i-Haqq saints, but there is not such an elaborate caste system as among the Yezidis.
Both sects emerged in a Muslim environment, as is clear from the names of their saints and religious leaders as well as from many of the terms in which their religious ideas are formulated. The Ahl-i-Haqq, however, appear to belong to the extremist Shia, whereas the Yezidis may originally have been an extremist anti-Shia Muslim sect.
Their similarities are due to the pre-Islamic background that the share. Some of the Ahl-i-Haqq stress, like the Yezidis again, that they are not Muslims but a separate religion, while others (among the Kurds mainly those of the Sahne district) prefer to present themselves as an esoteric sect within orthodox Shiism.