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Who really said it

When in Rome, do as the Romans do

Not his words — a later proverb built from Ambrose’s advice Saint Ambrose c. 339 – 397 AD · Bishop of Milan & Doctor of the Church
Disputed Free to reuse

The idea genuinely traces to Saint Ambrose, but he never said this sentence. His real advice — preserved by Augustine in Letter 54 to Januarius (c. 390 AD) — was specifically about fasting: “When I visit Rome, I fast on Saturday; when I am here, I do not fast.” The snappy “do as the Romans do” wording is a much later anonymous English proverb, not a translation of what Ambrose actually wrote.

Last verified 16 Jul 2026 · how we verify · spot an error?

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Disputed — copy with the correction

“When in Rome, do as the Romans do” Not Saint Ambrose's words. His real advice (via Augustine, Letter 54, c. 390 AD) was about Saturday fasting; "When in Rome, do as the Romans do" is a later anonymous English proverb.

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In context

Evoking the world of Saint Ambrose — Bishop of Milan, Doctor of the Church. Theme: "When in Rome, do as the Romans do". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

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Provenance

The source

Recorded in
Augustine, Letter 54 (to Januarius), ch. 2 §3
Translation
J. G. Cunningham, Nicene & Post-Nicene Fathers, 1st series, vol. 1 (1887)
When Ambrose spoke
advice given c. 384 AD, in Milan
Proverb wording
anonymous English; close form by 1599, modern form by 1777

When I visit Rome, I fast on Saturday; when I am here, I do not fast. [Observe] the custom prevailing in whatever Church you come to, if you desire neither to give offense by your conduct, nor to find cause of offense in another’s.

These are Ambrose’s actual words as Augustine reports them — advice about Saturday fasting, not the generalized proverb it later became.

Augustine, Letter 54 (to Januarius) at New Advent

What the record shows

  • Ambrose’s real advice survives in Augustine’s Letter 54 to Januarius (c. 390 AD): he fasted on Saturday in Rome but not in Milan, and told Augustine to follow each church’s custom.
  • A rhyming medieval Latin proverb, “Si fueris Romae, Romano vivito more; si fueris alibi, vivito sicut ibi,” is quoted in Jeremy Taylor’s Ductor Dubitantium (1660) and commonly rendered “When in Rome, do as the Romans do” — per Wikiquote.
  • The English proverb formed gradually: Henry Porter’s 1599 play has a close version, and the modern wording appears by 1777 — per Phrases.org.uk.
  • Wikipedia notes the saying is only “attributed to” Ambrose and traces it to the Monica–Augustine fasting episode rather than to any line he actually wrote.
Public domain

The proverb itself is a centuries-old anonymous English saying, documented in close form by 1599 and in its modern wording by 1777 — long in the public domain. Ambrose’s underlying words survive in J. G. Cunningham’s 1887 translation of Augustine’s Letter 54, also public domain (pre-1931). No identifiable rights holder exists for either.

Fact-check

Why this gets pinned on Saint Ambrose

The attribution is half-right in a way that trips people up: the principle really is Ambrose’s, but the famous sentence is not.

Saint Ambrose paraphrase, not a quote

Ambrose never wrote “When in Rome, do as the Romans do.” His documented words, reported by Augustine, were narrowly about fasting: “When I visit Rome, I fast on Saturday; when I am here, I do not fast” (Letter 54). The generalized proverb is a later English construction.

a single named author anonymous folk proverb

No one “coined” the English line. It accretes over centuries — from a medieval Latin rhyme, through Henry Porter’s 1599 play, to the modern wording recorded by 1777 (Phrases.org.uk).

The thought is Ambrose’s pastoral advice to Augustine (c. 384 AD); the proverb is anonymous English folk wisdom that took its current shape more than a millennium later — see Wikiquote’s sourced entry.

Context

The fasting dispute behind the proverb

In 384 AD Augustine and his mother Monica moved from Rome to Milan and hit a jarring difference: Rome fasted on Saturdays, Milan did not. Monica was troubled, so Augustine asked Bishop Ambrose what to do.

Ambrose’s reply was a small masterpiece of pragmatism — not a rule about Rome, but a rule about fitting in: keep the Saturday fast in Rome, drop it in Milan, and in any church you visit, follow the local custom to avoid giving or taking offense. That principle of graceful cultural adaptation is what the modern proverb distills.

Follow the custom of whatever church you come to — Ambrose’s actual counsel, later flattened into “do as the Romans do.”

Read the full story

The same advice is echoed in Augustine’s Letter 36 (to Casulanus), which also discusses the Saturday-fast controversy.

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Filed under

More provenance-checked quotes on the same theme, each with its reuse status.

Wisdom Change

Go further

Dig deeper

Trusted places to keep pulling the thread — primary archives, fact-checks, and scholarship. We show how we used each one before you leave.

Augustine, Letter 54 (to Januarius)newadvent.org

The primary source: Augustine reports Ambrose’s exact fasting advice, ch. 2 §3 (Cunningham trans., NPNF 1887).
Ambrose — Wikiquoteen.wikiquote.org

Sourced entry giving the Latin proverb, its Jeremy Taylor (1660) attribution, and the Augustine fasting citation.
When in Rome, do as the Romans do — Wikipediaen.wikipedia.org

Overview of the proverb: medieval Latin form, the Monica–Augustine story, and the ‘attributed to’ hedge.
Meaning and origin at Phrases.org.ukphrases.org.uk

Traces the English wording: Henry Porter (1599) and the modern form in letters of Pope Clement XIV (1777).
The proverb’s Augustinian connectionaleteia.org

Popular retelling of how Monica, Augustine, and Ambrose’s fasting exchange seeded the saying.

The author

About Saint Ambrose

Saint Ambrose

c. 339–397 AD · Bishop of Milan, Doctor of the Church

Ambrose of Milan was one of the four original Latin Doctors of the Church and the bishop who baptized Augustine of Hippo in 387 AD. His pastoral counsel to Augustine and his mother Monica about conforming to local church custom — recorded in Augustine’s letters — is the seed from which the “when in Rome” proverb is traditionally said to have grown.

For writers & researchers

Cite this

Primary source

Augustine of Hippo, Letter 54 (to Januarius), ch. 2, in Nicene and Post-Nicene Fathers, First Series, vol. 1, trans. J. G. Cunningham (Buffalo: Christian Literature Company, 1887). Proverb wording: anonymous English, documented by 1777.

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Quotle.info. “Who really said ‘When in Rome, do as the Romans do’?” Last verified 16 Jul 2026. https://quotle.info/who-said/when-in-rome-do-as-the-romans-do

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