Grammatical outline of the Avestan language - the language of Avesta, the holy book of Zoroastrianism. In the past, this language was called Zend. Belongs to the Indo-Iranian branch of the Indo-European languages ​ ​ (Iranian subgroup), is one of the oldest languages ​ ​ of the Indo-European family. The Avestan language was spoken in the eastern part of the territory of modern Iran, probably in the area of ​ ​ the Merv oasis.