My classification can obviously be discussed - categories are shifting - but my aim is essentially pragmatic.
Note on TEAMS’ groups
The links refer to general introductions, when they exist. The texts which are not in a thematic group are listed separately.
For the texts on Robin Hood, see the site of the project Robin Hood - note that many texts on Robin are post-medieval or in French.
Lastly, for the arthurian texts, which again does not all date from the medieval period, see the project Camelot ; one can find there, besides a list by author, a classification by character, by place and by theme.
These two projects include also general presentations, links to other resources, as well as an abundant modern iconography.