Josephus mentions Jesus twice. I posted the primary reference to Jesus a few weeks ago. Here is the second.

Festus was now dead, and Albinus was but upon the road; so he assembled the sanhedrin of judges, and brought before them the brother of Jesus, who was called Christ, whose name was James, and some others, [or, some of his companions]; and when he had formed an accusation against them as breakers of the law, he delivered them to be stoned;


This is yet another example of an external proof of the existence of the historical Jesus.