Among the characters mentioned in the Holy Quran is Zulgharnain, and based on the firmest opinion so far offered about him, he has been said to be Cyrus of Achaemenian (539-560). However, commentators of the Holy Quran have identified him as other historical figures such as: Fereidoun, Jamshid, Abdullah Ibn Zahak, Hermess and Alexander the Greek (son of Phillip). Quran has remembered him with two characteristics of being compassionate and just, and traditions have also revealed other aspects of his personality. The most surprising of all is that all above characteristics have been attributed to Alexander and they have considered him to be Zulgharnain, and the same idea has been abundantly mentioned in most of the commentary texts and philosophical and ethical treatises as well as mystic-Islamic sources. The idea has been gradually formed so that sometimes even other ideas have been opposed and resisted. However, recent historical information has thrown doubt on such an idea. Thus, the characters Alexander have assumed during the history are:(l) A political character with a kingly dignity; (2) A perfect sage whose shadow of exalted wisdom and thought appears throughout treatises on wisdom and ethics, and this influence encompasses high topics of self-knowledge down to the science of household management and land politics; (3) A mystic mien which has many evidences in the mystic poetry. The writer of this article thinks that this historical error has had three major reasons: (1) Iran’s defeat against Alexander;(2) The first person who equalled Alexander to Zulgharnain ,,:as Ave Cina, and since his personality was high, his error was also high and therefore influential; (3) The character of Alexander, son of Phillip, has been mixed up with aphrodisiacal Alexander. In view of these negligence, these stories prove to be inauthentic. However, behind this curtain there is a secret and a truth; that is, Zulgharnian has truly been in the position of a perfect man and/or in the position of "Grand Barzakhia" whom the present article tries to study.