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The term dubbel (also double) is a Belgian Trappist beer naming convention. The origin of the dubbel was a strong version of a brown beer brewed in Westmalle Abbey in 1856, which is known to have been on sale to the public by June 1861. In 1926, the recipe was changed, and it was sold as "Dubbel Bruin". Following World War Two, abbey beers became popular in Belgium and the name "dubbel" was used by several breweries for commercial purposes.