I'm glad to see the point being made about the modern-day use of the word "patron". I had just been thinking that very thing, that in English "patron" means a customer but in French "le patron" is "the boss" who owns the business. Neither of course reflect the role of the "patronus" of Ancient Rome, which I've just been reading up about in Wikipedia.
"Patronum in foro visito": I wonder how common it was for a client to go to a market-place to meet his patron. From what I understand was the Roman custom, in the morning clients would as a matter of routine go to their patron's house to make their "salutation" and would be received by him in the atrium, then they would accompany him to the Forum. The bigger the entourage the greater it raised the patron's prestige. I get the impression a "patronus" probably wouldn't be very pleased with clients turning up at the last minute in the Forum! Sounds downright disrespectful!