A mathematician's look at the chronology of the life of Jesus King Herod. The census that brought Joseph and Mary to Bethlehem. The guiding star. The building of the temple at Jerusalem. The crucifixion. These are among the events that we know of from the Bible that might be used to set the life of Jesus in the historical record. But generations of researchers have found that it is far from easy to reconcile the different accounts of Jesus's life given in the four Gospels, and to tie them to independently verifiable historical dates. And in contrast to his massive significance in the centuries since his life, Jesus of Nazareth was known by only a few during his lifetime, and left little mark on the historical records of his time. As a result there is still much debate about the exact dates of his life. When was he born? When did his ministry begin, and when did he die? Stephen Dudley takes a mathematician's approach to the issue. He looks not only at the events in the Gospels that might be linked to independent histories, but also at the difficulties of dating each one. What exactly is meant by `in his thirtieth year', for instance? Even simple statements like this can be surprisingly misleading. Using a careful process of logical analysis, this account tries to identify both the evidence and the pitfalls in interpreting it.