The geographic spread and political power of the Yazīdīs continued to increase in the 13th and 14th centuries, while their belief system continued to develop away from Islamic norms. By the early 15th century, surrounding Muslim rulers had begun to view them as apostates and rivals for political power, and clashes ensued. As the power of the Yazīdīs waned, their numbers were reduced by massacres and conversions, both voluntary and forced. The late 19th and early 20th centuries saw significant numbers flee to the Caucasus to avoid persecution. Most of the Yazīdī community in Turkey emigrated to Germany in the second half of the 20th century.
Yazīdī mythology says that they were created quite separately from the rest of humankind, being descended from Adam but not from Eve, and as such they seek to keep themselves segregated from the people among whom they live. Marriage outside the community is forbidden.
The Yazīdī cosmogony holds that a supreme creator god made the world and then ended his involvement with it, leaving it in the control of seven divine beings. The chief divine being is Malak Ṭāʾūs (“Peacock Angel”), who is worshipped in the form of a peacock. Malak Ṭāʾūs has often been identified by outsiders with the Judeo-Christian figure of Satan, causing the Yazīdīs to be inaccurately described as Devil worshippers. An important role in Yazīdī worship is played by bronze or iron peacock effigies called sanjaqs, which are circulated from town to town. Tradition holds that there were originally seven sanjaqs; it is thought that at least two still exist.
The breaking of divine laws is expiated by way of metempsychosis, or transmigration of souls, which allows for the progressive purification of the spirit. Sheikh ʿAdī, the chief Yazīdī saint, is believed to have achieved divinity through metempsychosis. Heaven and hell are also included in Yazīdī mythology.
The Yazīdī belief system is highly concerned with religious purity, and so Yazīdīs follow a multiplicity of taboos governing aspects of daily life. A variety of foods are forbidden, as is blue clothing. The word Shayṭān (Satan) is not pronounced, and other words with a phonetic resemblance are also avoided. Contact with outsiders is discouraged, and for that reason Yazīdīs have in the past sought to avoid military service and formal education. A strict caste system is observed.
The Yazīdī religious centre and object of the annual pilgrimage is the tomb of Sheikh ʿAdī, in the town of Lālish, Iraq. Two short books, Kitāb al-jilwah (“Book of Revelation”) and Maṣḥafrash (“Black Book”), form the sacred scriptures of the Yazīdīs. It is now widely suspected that both volumes were compiled by non-Yazīdīs in the 19th century and then were passed off as ancient manuscripts but that their contents do in fact reflect authentic Yazīdī oral tradition. A corpus of hymns in Kurdish is also held in great esteem.
[sic] And they’re being murdered, enslaved, rape, tortured…