Virtually all scholars of antiquity, both Christian and non-Christian, agree that
Jesus of Nazareth was a historical figure who existed and was crucified. While no contemporary, eyewitness accounts survive, multiple 1st and early 2nd-century non-Christian sources, including Tacitus, Flavius Josephus, Suetonius, and the Babylonian Talmud, confirm key details of his life and death.
Key Non-Christian Historical Mentions

Flavius Josephus (c. 93-94 AD): A Jewish historian who referenced Jesus as a wise man and teacher who was executed by Pilate.
Tacitus (c. 116 AD): A Roman historian and senator who confirmed that "Christus" was executed by Pontius Pilate during the reign of Tiberius.
Pliny the Younger (c. 112 AD): A Roman governor who described early Christians worshipping "Christ as a god".
Suetonius (c. 120 AD): A Roman historian who mentioned riots among the Jews in Rome instigated by "Chrestus" (likely a reference to Christ).
Mara bar Serapion (after 73 AD): A Syrian philosopher who wrote to his son about the "wise king" executed by the Jews.

Contextual Evidence

Enemy Attestation: Early opponents of Christianity, such as Celsus, never denied Jesus's existence, only his divinity.
Independent Sources: There are at least 14 independent sources (including early Christian, Roman, and Jewish) within a century of the crucifixion, such as the letters of Paul, who was a contemporary of Jesus.
Rapid Growth: The rapid expansion of early Christianity makes it historically unlikely that its founder was a myth.

These sources, when combined with early Christian writings and archaeological findings like the Pontius Pilate inscription, provide a strong historical basis for the existence of Jesus.