“All surviving sources, except Pliny the Elder, characterize Caligula as insane. However, it is not known whether they are speaking figuratively or literally. Philo of Alexandria, Josephus and Seneca state that Caligula was insane, but describe this madness as a personality trait that came through experience. Seneca states that Caligula became arrogant, angry and insulting once he became emperor and uses his personality flaws as examples his readers can learn from. According to Josephus, power made Caligula incredibly conceited and led him to think he was a god.” — from Wikipage of Caligula, Roman emperor from 37 to 41 AD.