Nixey tells the largely unknown story of how a militant religion deliberately subjected and annihilated the teachings of the classical world, and opened the way to centuries of unconditional adherence to "a single true faith”. The Roman Empire had been generous in welcoming new beliefs, but the arrival of Christianity changed everything. This new religion, despite preaching peace, was violent, ruthless and decidedly intolerant. Catherine Nixey studied Classical History in Cambridge, worked for many years as a teacher before turning to journalism. She talks to the journalist Guillermo Altares.