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How many first person biographies exist of Julius Ceasar, Cleopatra, King Herod, or Alexander the Great. Hundreds to thousands, not twenty, were in daily contact with them.
All historians know lack of first hand documentation is a very weak argument, especially if the documentation was not state protected in any way.
Boy, what a strawman you are attempting there. But first, how many first person biographies exist of Jesus of Nazareth? Since a first person biography is written in the first person (I, Me, etc) there are absolutely none existing for Jesus of Nazareth! Not only that, the gospels are not true biographies, they only cover about a total of 8 weeks out of a life that spanned over 1664 weeks and were written generations after the events that supposedly happened. Unlike the mythical Jesus Christ, we know what Caesar looked like, we have a complete history of his life thanks to the following individuals, most of who were eyewitnesses and wrote of him and his exploits:
Marcus Tullius Cicero (106-43 BC) was almost an exact contemporary of Julius Caesar.
In Caesar's struggle with Pompey, Cicero, governor of Cilicia, sided with Pompey but was subsequently pardoned by Caesar.
In March of 44 BC Cicero was a witness to Caesar's murder, though he was not a part of the conspiracy.
Following the assassination, Cicero made a series of speeches known as the "Philippics" which called on the Senate to support Octavian against Mark Antony. Cicero's "Second Phillipics" was an eulogy of Caesar's conquest of Gaul.
Unfortunately for Cicero Octavian reached a temporary rapprochement with Antony, who then ordered Cicero's murder.
Among some 900 preserved letters to and from Cicero are correspondence both about and with Caesar.
"... if Caesar does lose his head all the same, Pompey feels only the deepest contempt for him, trusting in his own and the state's troops..."
Cicero to Atticus, 7.8, 50BC.
Caius Sallust (86-34 BC) tribune, provincial governor and supporter of Caesar. His testimony is in a history "Bellum Catalinae".
Cornelius Nepos (c100-24): "Life of Atticus".
Gaius Valerius Catullus (c84-54 BC): "Carmina".
Gaius Asinius Pollio (76 BC-4 AD) was an ally of Caesar and founder of the first public library in Rome. He was a source used by Plutarch.
Virgil (70BC-17AD): "Aeneid".
Ovidius Naso (43BC-17AD): "Metamorphoses".
We have words written by Caesar himself (On the Gallic Wars) and words written by both his friends and his enemies. Artifacts confirm his life and death, as do his successors. Caesar established a style of government – and a calendar – which endured for centuries.
Cleopatra was reported by many of the same historians as was Julius Caesar, plus we have “royal edits” issued by her and engraved on steles in Alexandria and we have mentions of her in the works of Philo of Alexandria.
Herod the Great was mentioned by several contemporary Roman historians, Philo of Alexandria and, although not a contemporary, by Josephus who reported every “sin” ever committed by the man.
Now we will list every contemporary mentions of Jesus of Nazareth:
Well there was…..and then there was…..well maybe there was…..Dang, there aren’t any! Yet another would be Messiah – Apollonius of Tyana is reported on by contemporary writers, wrote several books himself and was accepted as the son of god by a rather sizable following. Jesus doesn’t seem to have written anything nor had any contemporary writers writing about him. Two of the twenty historians writing during that period were contemporary and Jewish (Philo of Alexandria and Justus of Tiberia) but never mention him even once. Philo was an expert on Jewish Cults of that period (Christianity would have been considered such), yet never mentions Jesus or any group that followed him. Tiberia was near Capernaum where Jesus supposedly preached often, yet Justus never once mentioned him. A fact that cause “wonderment” among early Church Fathers. There is more evidence that Jesus didn’t exist than there is evidence that he did!