Both Uses

patron
in
The Great Gatsby
(Edited)

The fact was infinitely astonishing to him, and I recognized first the unusual quality of wonder, and then the man — it was the late patron of Gatsby's library.
p. 54.1

patron = person who was making use of
When he realized what I was talking about, that there were twinkle-bells of sunshine in the room, he smiled like a weather man, like an ecstatic patron of recurrent light, and repeated the news to Daisy.
p. 89.6 *

patron = supporter

Definitions:

(1) (patron as in: a patron of the arts)
a regular customer; or someone who gives money or support to an organization, cause, or person
(2) (meaning too rare to warrant focus)
In ancient Roman history, patron referred to the more powerful person in a complex client-patron relationship. The term is still used in some cultures today to describe a property owner who is in charge of workers.

Also see patron saint.

Much more rarely, a patron is the proprietor of an inn.