The first century Jewish historian Josephus referred to the stoning of "James, the brother of Jesus who was called the Christ." - The Jewish Antiquities, Josephus, Book XX sec. 200

Tacitus, a Roman historian who lived during the latter part of the first century C.E. wrote: "Christus, from whom the name {Christian} had it's origin, suffered the extreme penalty during the reign of Tiberius at the hands of one of our procurators, Pontius Pilatus." - The Complete Works Of Tacitus, "The Annals," Book 15, par. 44.

The Encyclopedia Britannica also speaks on it, stating that "these independent accounts prove that in ancient times, even the opponents of Christianity never doubted the existence of Jesus, which was disputed for the first time and on inadequate grounds by several authors at the end of the 18th, 19th, and at the beginning of the 20th centuries." - (1976), Macropedia, Vol. 10, p.145.