The Book of Kings

The Book of Kings was a book written by, obtained by Ezio Auditore da Firenze in the 16th century in Constantinople.

Summary
''A massive sixty-thousand verse work of Persian poetry that weaves history and myth together to tell the history of the world, from the beginning of time up to the seventh century BCE. Written over the course of 30 years in the late tenth century, it is a monumental work of incredible historical and artistic merit.

Source

 * Assassin's Creed: Revelations