Xwedodah (Persian: خویدوده xidude; Avestan: xᵛaētuuadaθa) is a type of consanguine marriage historically practiced in Zoroastrianism before the Muslim conquest of Persia. Such marriages are recorded as having been inspired by Zoroastrian cosmogony and considered pious. It was believed to be a high act of worship in Zoroastrianism. This form of direct familial incest marriage allowed Zoroastrians to marry their sisters. There are few examples that show xwedodah was practiced by royalty and nobility, and possibly clergy, but it is not known if it was commonly practiced by families in other classes. In modern Zoroastrianism it is near non-existent, having been noted to have disappeared as an extant practice by the 11th century.
Etymology While the Avestan term xᵛaētuuadaθa is still of ambiguous meaning and function in the Young Avestan texts, it is only later in Middle Persian that the term becomes used in its current form. The earliest use of the word Xwedodah is in Middle Persian in the Ka'ba-ye Zartosht inscription at Naqsh-e Rostam. The nineteenth-century qaêtvadatha style (with q instead of Avesta x) and similar writings reappear in modern literature. The first part of the compound seems to be a "family" (or similar) of Khito (xᵛaētu), which is generally thought to derive from the "self" (xᵛaē-) with the suffix -you (-tu-), although this is not entirely straightforward. The second part, vadaθa, is nowadays generally regarded as a derivative of the verb (From * Wad-) 'resulting in marriage', related to other Iranian and Indo-European languages which refer to marriage or marriage partner (compare with ancient Indik). "Wife" Av. Vaδū; Pahlavi wayūg (Pers. Bayu) "bride"; Avestan vaδut "one who has reached the age of marriage"; Pahlavi wayūdag "bride's room". This etymology was suggested by Carl Goldner, and accepted by Émile Benveniste and Christian Bartholomae, and became a popular opinion among Western scholars. However, there is no * vadha- to Vedic or * vada- root in the Avesta of the vadh root; in Avesta the vāδaya and upa.vāδaiia- 'lead (to marry)' and uzuuāδaiia are 'leaving the father's house'. vadh-Vedic, vad-Avestan should not be confused with vah-Avestan "to take", vaz-Avestan with the uhyá-unknown form.
Sanctification of Xwedodah In Zoroastrian traditions, it is said that Ahura Mazda created all Yazatas, therefore all Yazatas are considered spiritual children of Ahura Mazda. Spenta Armaiti, one of the Amesha Spenta, is also considered the consort of Ahura Mazda as queen of heaven and mother of earth. In one tradition in the sixth "Gāh" Keyumars, the first human, was created from mud on the left side of "Veh-Dāit" to help Ahura Mazda, and he was created in the form of a 15-year-old boy. In another tradition, Keyumars was the result of intercourse between Ahura Mazda and Armaiti, and she gave birth to Keyumars. In this tradition, it's also considered that Mashya and Mashyana are also children of Armaiti since she's Mother Earth, and not that Mashya and Mashyana are only the children of Keyumars.
Zoroastrian religious sources Most of Pahlavi's texts are self-contained by Edward William West's comments. Brief evaluations and references include Friedrich Spiegel and standard books on Zoroastrianism, such as Boyce.
Avestan In the Old Avestan texts known as the Gathas, believed to have been written by the founder of the faith Zoroaster, Armaiti of the Amesha Spenta is referred to as the "daughter" of Ahura Mazda, the highest deity within Zoroastrianism. The Younger Avestan texts of the Yashts, in particular the Frawardin Yasht, mention that the relationship is less a literally familial one and instead one of unity of essence and nature with Ahura Mazda as "father and commander" of the group. In the youngest Avestan text, the Vendidad, the urine of sheep, oxen, and those who marry next-of-kin are viewed as being particularly pure and devoid of corruption by Ahriman and therefore able to be used by corpse-bearers to wash and purify themselves, however, it does not clarify the terms next-of-kin.
Pahlavi Xwedodah became a more solidified doctrine in the Pahlavi/Middle Persian literature of post-Sassanian Zoroastrianism. In Zoroastrian cosmogony as explained by the Pahlavi text Bundahishn, Ahura Mazda is said to not have sired the other divine creations but rather to have fashioned or set them in their proper places and is referred to as both "mother", through spiritual nurturing, and "father", through material development, of all existence. The Denkard, which includes passages encouraging the action, and the Dadestan-i Denig both claim that not only was the world created through xwedodah, but humanity from the Consanguine marriage of Mashya and Mashyana, who were born from the spiritually-incestuous relationship of Keyumars (produced from xwedodah with Armaiti) and Spenta Armaiti, also developed from it to the pleasure of Ahura Mazda. In the third book of the Denkard, which consists of a collection of Wisdom literature that can at times contradict itself, regarding an inquiry whether it was appropriate to marry a Hebrew, xwedodah is referred to not as consanguine marriage but rather as marriage within the faith which is viewed as providing honor and strength to those who engage in it and can include incestuous relationships of various kinds. After discussing the mythological origins of the various forms of xwedodah, it expresses the following view on parent–child sexual relations in such societies:
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