A brief history of beer: Episode 2, Imperial Stout.
Around 18th century, Peter the Great opened Czarist Russia to the West. As you imagine, the immediate result of this move was that the commerce and economy between Czarist Russia and Western European countries flourished. At that time, Arthur Guiness had just took “Porter” recipes from England to Ireland while he increased the dark, coffee-tinted profile of the style. He also added “Extra Stout” sign on the label of Guiness beer, which makes him the founder of the new beer style called “Stout”.