Dublin, Ireland

Irish brewers adopt unmalted roasted barley

Malt taxation made unmalted roasted grain the cheaper route to colour and roast, and the resulting sharpness became the defining flavour of Irish stout.

1820–1880

Why it matters

A fiscal accident that produced the single ingredient most responsible for the difference between Irish stout and English porter.

How well this is established

Certainty	Well attested. Broadly agreed across sources, though the precise dating or detail may vary between them.
When	1820–1880. Recorded as a period rather than a date because it happened over time.
Where	Dublin, Ireland

Styles this shaped

Dry stout3.8–5% ABV
Sharp roasted-barley bitterness over a light body and a very dry finish — much lighter to drink than its colour suggests.

Traditions

Irish stout brewing — The Dublin divergence from London porter, built on unmalted roasted barley and later on nitrogen dispense.

Either side of this

← 1817: Daniel Wheeler patents black malt · 1820: Baltic brewers ferment export porter as a lager →

See the whole sequence on the beer history timeline.

Last reviewed 2026-08-16.