Parallel Lives

Parallel Lives was a book written by, obtained by Ezio Auditore da Firenze in the 16th century from one of Constantinople's many book shops.

Summary
''Plutarch's famous examination of human character and virtue is a collection of biographies of famous men (only men, sadly) arranged in parallel groups: each Greek biography is paired with a more contemporary Roman equivalent. Less a historical treatment of its subjects, "Parallel Lives" is an investigation of the influence of character on human destiny.''

Reference

 * Assassin's Creed: Revelations