Opinion: Who is the most underrated/under read Philosopher?

I will start... I find Aesop and the Fables to be underrated and wrongly pointed at simply for children. These stories can and must be applied to adult life to live a better and more virtuous life. IMO.

(Yes, I am aware that some think Aesop was potentially not one person, but many, and some question he even existed... like Homer).

Would love to hear what you all think.