This ancient mosaic depicts the Last Supper, which contributed in to the superstition surrounding the number 13. There were 13 guests, the last being Judas Iscariot, shown at the mosaic's bottom receiving the bread that Jesus dipped (John 13:18-30). | Public Domain Secular mainstream historical academia has “no doubts at all” that Jesus of Nazareth was an actual historical figure, according to an Australian scholar and Anglican priest. A recent episode of the Dallas Theological Seminary podcast “The Table,” posted to YouTube last week, focused on the question of the historicity of Jesus. John Dickson, a religion historian who specializes in early Christianity and is the director of the Centre for Public Christianity in Australia, was one of two experts interviewed on the podcast.