Tacitus - The Annals
A senator and historian of the Roman Empire, Publius Cornelius Tacitus, referred to Christ in a work he penned called the Annals in A.D. 116. On one page, he described the execution of "Christus" (Christ) by Pontius Pilate and provides one of the earliest non-Biblical accounts of Christians, "Consequently, to get rid of the report, Nero fastened the guilt and inflicted the most exquisite tortures on a class hated for their abominations, called Christians by the populace. Christus, from whom the name had its origin, suffered the extreme penalty during the reign of Tiberius at the hands of one of our procurators, Pontius Pilatus, and a most mischievous superstition, thus checked for the moment, again broke out not only in Judea, the first source of the evil, but even in Rome, where all things hideous and shameful from every part of the world find their centre and become popular. Accordingly, an arrest was first made of all who pleaded guilty; then, upon their information, an immense multitude was convicted, not so much of the crime of firing the city, as of hatred against mankind" (Annals, Book 15). Contrary to other mentions of Christ in historical documents outside the Bible, the reference here in the Annals is regarded by most modern scholars to be authentic.
In addition to the consistency and extraordinary account of the four Gospels in the New Testament and the 13 books written by Paul, these valuable historical documents can offer further evidence of the existence of the greatest man to ever walk this planet, Jesus Christ.