"Legio," Latin for "a gathered body of soldiers," relates to "Re-legion," meaning to re-gather such a body. Religion can thus be crafted to serve political causes and inspire revolution. Rome tolerated many religions but persecuted Christians, especially under Nero, who blamed them for the Great Fire of Rome. Nero, the last Julian Caesar, saw Christianity as a political threat aiding his rivals. In 69 AD, the Flavians replaced the Julians as the new Caesars. By 325 AD, Neo-Flavian Caesar Constantine established the Catholic Church, solidifying Christianity’s role as a revolutionary force. In 410 AD, Arian Christian Visigoths sacked Rome, marking the beginning of the Dark Ages. 388