The Flute Girl

The Flute Girl was a book written by, obtained by Ezio Auditore da Firenze in the 16th century in Constantinople.

Summary
''This obscure Greek drama from the fourth century BCE, thought lost for over a millennium, contains one of the earliest descriptions of ancient Byzantium, referring to the city as a rowdy port full of drunks and crooks. Whether this was surprising to audiences at the time is unknown, but that this was worth mentioning seems significant of something. Jealousy, perhaps.''

Source

 * Assassin's Creed: Revelations