Penemue ("The Inside") in Enoch lore, was one of the Watchers/Grigori. He "taught mankind the art of writing with ink and paper, and thereby many sinned from eternity to eternity and until this day. For man was not created for such a purpose."
Penemue also taught "the children of men the bitter and the sweet and the secrets of wisdom." He is one of the curers of stupidity in man mentioned in Bereshith Rabba. (Wikipedia)