Dennis the Short (470-544 CE) or Dionysius Exiguus, a Scythian monk who worked in Rome, came up with the idea of dating everything from the birth of Christ, instead of the Roman counsels who had held office. In 525 CE, he developed his Christocentric calendar, but he was off by a few years in his calculations, since Jesus may have lived from 6 BCE-26 CE. His dating system was known as Anno Domini, the year of Our Lord. This AD system did not become popular until the Carolingian Reform of the 9th ninth century and the promulgation of the Gregorian calendar in the 16th century. Since then, all world events have centered on the birth of Christ. At the 2000 millennium year celebrations even non-Christian countries such as China and India celebrated the 2000th anniversary of the birth of Jesus Christ. In the twentieth century, Jewish and Christian scholars adopted the term CE, or Common Era, showing a neutral stance towards Christ. Now practically every country dates things from the birth of Christ, whether they consider themselves Christian or not. 2018 CE means 2018 years since the birth of Christ, the Common Era. The time before Christ is called BC, before the Common Era, BCE.