This game is one of the most well-regarded Twine games available, as demonstrated by its listing on the IFDB Top 100 as of 2016.
In this game, you play as a chancellor of a university, brother to a Duke. The setting is not historical England, though there are similarities.
The game is serious, and focuses on your relationship with your brother. You remember your past, learn about his present activities, and make choices about your future.
It's very interesting as a study in relationships, and also as a medieval-esque game.