Context: Stout and porter are dark beers made using roasted malts or roast barley, and typically brewed with slow fermenting yeast. There are a number of variations including Baltic porter, dry stout, and Imperial stout. The name Porter was first used in 1721 to describe a dark brown beer popular with the street and river porters of London. This same beer later also became known as stout, though the word stout had been used as early as 1677. The history and development of stout and porter are intertwined.

Question: In what year was the name Porter first used for a dark beer?
Answer: 1721

Question: In what year was the name stout first used to describe a dark beer?
Answer: 1677

Question: What do you call a dark beer that is brewed with roasted malts or barley?
Answer: Stout and porter

Question: What type of yeast is used to make stout and porter beers?
Answer: slow fermenting yeast

Question: In what country was Porter beer popular in 1721?
Answer: London

Question: What name was first used in 1712?
Answer: Unanswerable

Question: What name was used as early as 1767?
Answer: Unanswerable

Question: What are made with slow fermenting malts?
Answer: Unanswerable

Question: What is Imperial porter a type of?
Answer: Unanswerable