When in Rome, do as the Romans do

When in Rome, do as the Romans do (Medieval Latin: 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.

[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.

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