The reality of Hasan Sabah Although Hasan Sabah was considered a controversial leader by many Muslims, he was undoubtedly a patriot who endeavored to undermine the Seljuks and Arabs in an effort to revitalize the Iranian empire. On the other hand, Hamid al-Ghazali, a devout Muslim, was strongly opposed to secular knowledge and philosophy, which led him to advocate against the spread of philosophical teachings among Muslims.
Moreover, there is a significant error concerning the supposed friendship between Khayyam, Hasan Sabah, and Nizam al-Mulk. Historically, Hasan Sabah was 17 years younger than Khayyam, and Khayyam was 21 years younger than Nizam al-Mulk, making it highly unlikely that these three dignitaries could have had a friendship.
Although the series is well-directed and cities like Samarkand and Isfahan are depicted beautifully, portraying Hasan Sabah as a villain does not seem fair.
Finally, I hope that someday a movie will truly portray Hasan Sabah accurately.