How do our sources about the life of Jesus compare to our sources about other ancient figures? Michael Licona (Ph.D. in New Testament Studies from the University of Pretoria), explains:
Caesar Augustus is regarded as Rome’s greatest emperor and was ruling the empire when Jesus was born. Historians rely on six chief sources to learn about Augustus’s adulthood: a funerary inscription that is nearly 4,000 words in length, Plutarch who wrote around 90 years after Augustus’s death, and four others writing 100-200 years after his death. When we consider that this is what we have for the greatest Roman emperor, four biographies of Jesus written within 35-65 years of His death is pretty good!
Copan, P. (Ed.). (2012). Come Let Us Reason: New Essays in Christian Apologetics. Retrieved from https://www.amazon.com/Come-Let-Reason-Christian-Apologetics/dp/ p. 143