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This research explains the principles governing major codes of "Hodhod" and "Simorgh" in the Attar's Mantiq al-Tayr, and codes of "The King of Birds" and the "Storyteller Bird" in the Avicenna's Risalat Al-Tayr. The significance of this study lies in its endeavor to abolish ambiguities regarding the meanings of these cods which due to personal and subjective trends of interpretation and commentary on these allegorical works is institutionalized. This study tackles the issue of necessary allegorical and coded writing styles when texts came to deal with epistemological concepts which was a result of conceptual conflicts that existed from fifth century to seventh century, and forced interpretations on texts’ meanings which were merely a reflection and satisfaction of expectations of critics of an age. This study is library research and is based on a thorough examination of the content of relevant literature on this subject, each in its pertinent context, followed by a co-examination of intersections between the texts and the contexts. This study concludes its premises through deep analysis and critically supported interpretations. The findings of this study reveal the contradictions that govern interpretations of the aforementioned concepts. Furthermore, findings of this study demonstrate the necessity of further investigation in this field