Ancient history

What does when in Rome do as the Romans mean?

"When in Rome, do as the Romans do" is a proverb that encourages travelers to adapt to the culture of the region they are visiting. This proverb may also be applied figuratively to new circumstances or ways of doing things.

The first known reference to the proverb "When in Rome, do as the Romans do" was in 390 AD by St. Ambrose.