The concept of subjects and relations goes all the way back to the middle ages and even as far back as Aristotle. If you like, you can read more with this link:
http://plato.stanford.edu/entries/relations-medievalHowever, they only thought of subjects and relations for the purpose of organization, not for emotions.
Theories of emotions go way back as well. Here is a link to Benedictus Spinoza's ideas of them from the 17th century:
http://www.ship.edu/~cgboeree/spinozasemotions.html"
He, as well as others, do not describe emotions in terms of subjects and relations.
