When in Rome, do as the Romans do (la-x-medieval|Sī fuerīs Rōmae, Rōmānō vīvitō mōre; sī fuerīs alibī, vīvitō sīcut ibī), often shortened to when in Rome..., is a proverb attributed to Saint Ambrose.[1] [2] The proverb means that it is best to follow the traditions or customs of a place being visited. A later version reads when in Rome, do as the Pope does.[3]
In the 4th century, Saint Monica and her son, Saint Augustine, discovered that Saturday was observed as a fast day in Rome, where they planned to visit. However, it was not a fast day where they lived in Milan. They consulted Saint Ambrose who said "When I am here (in Milan) I do not fast on Saturday, when in Rome I do fast on Saturday".
That reply is said to have brought about the saying "When in Rome, do as the Romans do".[4] [5]
. Dictionary of Idiomatic English Phrases . . Dixon, James Main . James Main Dixon . 1891 . 273 . 156125145.
. Dictionary of Phrase and Fable: Giving the Derivation, Source, Or Origin of Common Phrases, Allusions, and Words that Have a Tale to Tell . . Brewer, Ebenezer Cobham . E. Cobham Brewer . 1900 . 1070 . 3 . 258268902.