I don't think much is known about Spartacus before the revolt. Probably a soldier, made into a slave. So they're making this shit up as they go so far. Fellow gladiator Crixus is a real, historical person. The Ludus at Capua is really where they trained, and Batiatus was really the name of the owner (though they changed his full name for some reason - it was correct in the Kirk Douglas film). Marcus Crassus did indeed exist and was instrumental in military action against the revolting slaves. (Revolting slaves - heh, well, they didn't bath often!). Otherwise, yeah, it's a lotta made up characters and stuff.