We have general and specific (such as the one about ancient sports).
We have general and specific (such as the one about ancient women).
Below are a few credible websites with information on your topic. There are more websites out there--but you have to know how to evaluate their credibility.
Search for university-authored webpages by using this phrase: inurl:edu plus any keywords.
Search for nonprofit organizations with this: inurl:org plus any keywords.
Museums are usually nonprofit, but you could also use the keyword museum plus your other keywords.
Avoid any content farm websites, such as about.com, ehow, helium--there are so many. If the author isn't credible and the site is full of ads, that's a bad sign.