When I am here, I do not fast on Saturday; when at Rome, I do fast on Saturday.

Quando hic sum, non iuieno Sabbato; quando Romae sum, iuieno Sabbato.

Original text (Latin)

Notes from Wikiquote

Here, in Letter 36 "To Casulanus" (396 A.D.), Augustine is quoting Ambrose. | Origin of the phrase: "When in Rome, do as the Romans do."

Quote text and notes from Wikiquote: Augustine of Hippo (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.