When in Rome, do as the Romans do

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When in Rome, do as the Romans do[1] (often shortened to when in Rome...)[2] or a later version when in Rome, do as the Pope does,[3] a proverb attributed to Saint Ambrose, means that it is advisable to follow the conventions of the area in which you are residing or visiting.[1]

Saint Monica and her son, Saint Augustine, found out that Saturday was observed as a fast day in Rome, where they planned to visit. It was not a fast day in Milan, where they lived. 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]