Check out the Arab & Middle Eastern Studies guide from the Main Campus for an extensive list of internet resources in this area of study.
Internet sources are the easiest and fasted place to go for information. But be careful, because most internet sources do not go through a peer-review process or have any kind of oversight, so anyone could put something about Medieval history on the Internet.
Source: Washington Post
There are some good Internet websites on Medieval History. A few clues will help you to determine if an Internet source is reliable or not.
These are just some things to look for when evaluating Internet resources.
* Tip: if you find something on a website that seems legitimate, cross-reference it - especially academic resources - to verify its autheniticity.