Philo was a Hellenistic Jewish philosopher who left behind one of the richest bodies of work from antiquity, yet his personality and intellectual development have remained a riddle. Maren Niehoff presents the first biography of Philo, arguing that his trip to Rome in 38 CE was a turning point in his life. There he was exposed not only to new political circumstances but also to a new cultural and philosophical environment. Following the pogrom in Alexandria, Philo became active as the head of the Jewish embassy to Emperor Gaius and as an intellectual in the capital of the empire, responding to the challenges of his time and creatively reconstructing his identity, though always maintaining pride in the Jewish tradition. Philo's trajectory from Alexandria to Rome and his enthusiastic adoption of new modes of thought made him a key figure in the complex negotiation between East and West.