What medieval romances do you know of?

I’m interested in medieval romances – especially those that are thought of as the epitome of romance, but upon closer look are really toxic and twisted and unhealthy. So far, I really only know of Abelard and Heloise – Romeo and Juliet, Wuthering Heights, Jane Eyer, etc are all not medieval (though if you know of them, suggest them anyway). What ones do you know of?

*Note: I’m looking for romantic couples, not arranged marriages or power couples and what have you where romance and/or love had nothing to do with the couple’s relationship.