Ferdowsī. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/204578/Ferdowsi this assumption was based upon his presumed authorship of Yūsof o-Zalīkhā, an epic poem on the subject of Joseph and Potiphar’s wife, which, it later became known, was composed more than 100 years after Ferdowsī’s death.
