About this time Caesar Augustus, the Roman Emperor, decreed that a census should be taken throughout the nation. (This census was taken when Quirinius was governor of Syria.) Everyone was required to return to his ancestral home for this registration. And because Joseph was a member of the royal line, he had to go to Bethlehem in Judea, King David’s ancient home- journeying there from the Galilean village of Nazareth. He took with him Mary, his fiancee, who was obviously pregnant by this time.
Luke 2:1-5 The Living Bible