Guinness (/ËÉ¡ÉªnÉ¨s/) is an Irish dry stout that originated in the brewery of Arthur Guinness (1725â1803) at St. James's Gate, Dublin. Guinness is one of the most successful beer brands worldwide.It is brewed in almost 60 countries and is available in over 120.rthur Guinness started brewing ales in 1759 at the St. James's Gate Brewery, Dublin. On 31 December 1759, he signed a 9,000 year lease at Â£45 per annum for the unused brewery.