Who is everyone's favourite "obscure" composer and what are their best works?

By "obscure" I mean composers that most people, even on this subreddit, likely haven't heard of, or if they have, only in passing mention but have not actively listened to their works.

Mine is Ferdinand Ries, which some people may know from his association with Beethoven or his 3rd Piano Concerto. I think his 7th symphony is a banger, but most of his output is criminally underrated.

So what other composers are missing out on because we haven't stumbled across them yet?

EDIT: You guys did not disappoint, looks like I have some listening to do.

EDIT #2: I'm going to listen to all of the pieces and reply, it may take me a few months to get to all of them though.