High Quality Content by WIKIPEDIA articles! Libri tres contra Galileos (in brief Contra Galileos; in English, Three Books Against the Galilaeans, meaning Christians) was a Greek polemical essay written by the Roman Emperor Flavius Claudius Julianus, commonly known as Julian the Apostate, during his short reign (361–363). Despite having been originally written in Greek, it is better known under its Latin name, probably due to its extensive reference in the polemical response Contra Julianum by Cyril of Alexandria.