While the main source for information about Jesus is the New Testament, Jesus is referred to as a real person in several non-biblical sources.
For example, the first-century Roman historian Cornelius Tacitus (AD 56-117) says that Jesus suffered under Pontius Pilate (AD 26-36). Seutonius (AD 69-122), an official of the Emperor Hadrian (AD 117-138), refers to Christ as living in the first century. And the famous Romano-Jewish historian Flavius Josephus (AD 37-97) spoke of Him as a man who performed great feats and says that many Jews and non-Jews became his disciples.
These and other references leave no doubt in the minds of virtually every historian today that the person of Jesus existed.