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.