I was just looking up some information on gladiators and slave markets, and thought I'd share this site with you all - it's one I use a lot, because it's easy to get an overview here and it's also easy to read. So instead of scrolling through tons of Wikipedia pages for info, this is a bit easier - just click the link below 

Roman Empire and Colosseum

And then I'll leave you with this, because noone says 'fuck the gods' like Agron...