Shihab al-Din Suhrawardi (1153-1191 CE), known as Shaykh Ishraq, is the Iranian philosopher, Sufi, martyr and the founder of Ishraqi theosophy. He could be considered as the restorer of the theosophy of Fahlawiyun or the Khusrawani theosophy of ancient Iran. By using the Zoroastrian sources and focusing on Greek philosophy, Suhrawardi combines these two eastern and western currents of philosophy in Islamic mysticism. He interprets these teachings not only in his important Arabic works such as Hikmat al-ishraq (Theosophy of Illumination), but also in his Persian works which are mostly symbolic-mystical treatises. In these Persian treaties, he presents the principals of Khusrawani theosophy by using the symbolic functions of mythical characters of ancient Iran, such as Firiydun, Kaykhusru, Simurgh, Zal, Rustam and Isfandiyar. His narrations of these mythical characters are based on the previous works such as Shahnamah. However, in some points there are great differences between his narrations and the previous ones, so much so that we can mention him as the creator of these new narrations. The climax of this innovation is in the story of the struggle between Rustam and Isfandiyar. This change helps Suhrawardi to express his ideas through the symbolic functions of these characters, and these symbols are only understandable to those who are acquainted with Ishraqi theosophy and mysticism. This article deals with these symbols and interprets their roles in Persian treatises of Shaykh-i Ishraq such as Aql-i surkh, Alwah-I’Imadi, Lughat-i Muran and Safir-i Simurgh.