London, United Kingdom
Porter emerges in London
A dark, aged London beer becomes the first mass-market industrial product, though how and when it appeared is disputed.
1700–1750
The version you have probably heard
“Porter was invented around 1722 by Ralph Harwood of Shoreditch, who created "entire butt" as a single beer replacing a publican’s blend of three.”
The Harwood story appears only decades after the fact and is not supported by contemporary sources. Historians working from period records describe a gradual evolution of London brown beer, shaped by existing aged-and-fresh blending practice and by the economics of large breweries, rather than an invention by one person at one moment.
What is not in doubt is the outcome: by the middle of the eighteenth century porter dominated London brewing and made its brewers among the largest manufacturing enterprises in the world. Its ability to age well in very large vats is what made brewing at that scale possible.
Why it matters
The first beer brewed at genuinely industrial scale, and the commercial foundation of modern brewing.
How well this is established
| Certainty | Contested. Credible sources genuinely disagree about what happened, and BeerHQ presents the disagreement rather than picking a winner. |
|---|---|
| When | 1700–1750. Recorded as a period rather than a date because it happened over time. |
| Where | London, United Kingdom |
Styles this shaped
Traditions
- London porter brewing — The first industrial-scale brewing tradition, built in eighteenth-century London around dark beer, long maturation and enormous vats.
Either side of this
← 1553: Bavaria restricts brewing to the cooler months · 1780: Pale ale is exported to India →
See the whole sequence on the beer history timeline.
Last reviewed 2026-08-16.