Both Uses of

patron
in
The Bourne Ultimatum

Bourne palmed the napkin along with a hundred-franc note and signaled the bartender, who adjusted his steel-rimmed glasses as if the unknown patron's gesture were an impertinence.†

If a patron did not know he was in Paris, he might think he was dining on Rome's Via Frascati, at one of the many commercialized family ristoranti lining that ancient street.†
*

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)
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.