Hello Theodoric,
Do the writings of Josephus and Tacitus count?
For all I know those accounts may or may not be reliable, but
I always thought there was a general consensus that person
we call Jesus did exist base on non biblical sources.
Regards,
"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs