There are many sites related to the medieval period. Reenactors, suppliers of replica equipment and weapons and, of course, custodians of ancient castles and abbeys. Some are listed here and some have been used by me but their appearance here is not a recommendation unless I have said so in the description. I am, of course, not responsible for any content in external sites.
While I check these links from time to time you may discover one which has moved or has stopped working. If this is the case please get in touch and let me know.