Ancient Iranian religion was strongly connected. Beginning in the early 10th-century BC, the ancient Iranian religion was gradually displaced by Zoroastrianism, which contains many essential aspects of its predecessor. The sources on ancient Iranian religion, though limited, consist of textual and material sources. The textual sources are both Iranian and non-Iranian. An important Iranian source is the Avesta, which are Zoroastrian sacred scriptures made in the Avestan. This is considered the principal source of knowledge on ancient Iranian religions. It is a collection of several texts that seems to have been over a large span of time by a variety of authors. These
Mehrdad Avesta and history of arts at the University of Tehran. He married two times in 1954 and 1966 and he had one son and three daughters. Avesta died in his office at Vahdat Hall of Tehran while he was editing a poem work. Mehrdad Avesta was born in 1929, in Borujerd. Born to a family of artistic history, he was also greatly interested in art, so he started writing poems from early ages, which were also published. He got his degree in Theology, and then studied philosophy. Along his formal education, he started working as a teacher. Besides, he served in