Question: When was the brewery founded by the family who resided in the Lemp Mansion founded?

Context paragraphs:
Grolsch Brewery: Grolsch Brewery (Koninklijke Grolsch N.V. - "Royal Grolsch"), known simply as Grolsch (] ), is a Dutch brewery founded in 1615 by Willem Neerfeldt in Groenlo.  In 1895 the de Groen family bought the brewery.  They had started their own brewery in Cuijk the Netherlands in the early 19th century.  It held a significant stake until November 2007.  The main brewery is located today in Enschede.

Brains Brewery: Brains (S. A. Brain & Company Ltd) is a regional brewery founded in 1882 in Cardiff, Wales, by Samuel Arthur Brain.  The company controls more than 250 pubs in South Wales (particularly in Cardiff), Mid Wales and the West Country.  The company took over Crown Buckley brewery in Llanelli in 1997, and Hancock's Brewery in 1999.  Brains moved to the former Hancock's brewery just south of Cardiff Central railway station in 2000.  The Old Brewery, in Cardiff city centre, has been developed into a modern bar and restaurant complex.

Lemp Mansion: The Lemp Mansion (3322 DeMenil Place, St. Louis, Missouri) is a historical house in Benton Park, St. Louis, Missouri.  It is also the site of four suicides by Lemp family members after the death of the son Frederick Lemp, whose William J. Lemp Brewing Co. dominated the St. Louis beer market before Prohibition with its Falstaff beer brand.  The mansion is said to be haunted by members of the Lemp family.

Starobrno Brewery: Starobrno Brewery (in Czech: Pivovar Starobrno) is a Czech brewery located in the city of Brno.  It was built as a successor of the brewery founded in 1325, as a part of Cistercian convent.  The brewery was named "Starobrno Brewery" only in the second half of the 19th century.  In 2009, Starobrno Brewery produced more than one million hectoliters of beer.  The same year, the brewery merged with the Royal Brewery of Krušovice and became a part of the Dutch brewing company Heineken.

Falstaff Brewing Corporation: The Falstaff Brewing Corporation was a major American brewery located in St. Louis, Missouri.  With roots in the 1838 Lemp Brewery of St. Louis, the company was renamed after the Shakespearean character Sir John Falstaff in 1903.  Production peaked in 1965 with 7,010,218 barrels brewed, and then dropped 70% in the next 10 years.  While its smaller labels linger on today, its main label Falstaff Beer went out of production in 2005.  The rights to the brand are currently owned by Pabst Brewing Company.

Żywiec Brewery: Żywiec Brewery (] ) is a brewery founded in 1856, in Żywiec, Poland, then part of Austria-Hungary.  It was nationalised after the Second World War.  Grupa Żywiec S.A. consists of five main breweries: Żywiec Brewery, Elbrewery, Leżajsk, Warka Brewery and Cieszyn Brewery.  Currently the Dutch Heineken Group (Heineken International Beheer B.V.), with a 61% shareholding, has control over major operations.  The brewery has the capacity of producing 5 million hls a year, making it the largest brewery in Grupa Żywiec.

Ansells Brewery: Ansells Brewery (Ansells) was a regional brewery founded in Aston, Birmingham, England in 1858.  It merged with Taylor Walker and Ind Coope in 1961 to form Allied Breweries.  The brewery remained in operation until 1981, after which production transferred to Allied's Burton upon Trent brewery; some former staff setting up the Aston Manor Brewery.

Murphy's Brewery: Murphy's Brewery was a brewery founded in Cork, Ireland in 1856 by James Jeremiah Murphy (James J. Murphy).  It was known as Lady's Well Brewery until it was purchased by Heineken International in 1983, when the name changed to Murphy Brewery Ireland Ltd.  The name of the brewery was recently changed to Heineken Brewery Ireland, Ltd.  The brewery produces Heineken, Murphy's stout and other Heineken products for the Irish market.

Deschutes Brewery: Deschutes Brewery is a craft brewery founded in 1988 as a brew pub in Bend, Oregon, USA, known for such products as Black Butte Porter and Mirror Pond Pale Ale.  In 2008, the brewery opened a second pub in Portland’s Pearl District.  Deschutes Brewery now ships beer to 28 states, the District of Columbia, and around the world from its main brewing facility located on the banks of the Deschutes River.  As of 2016, Deschutes was the eighth-largest craft brewery and fifteenth-largest overall brewery in the United States, producing 250000 usbeerbbl of beer in 2012.

Lemp Brewery: The Lemp Brewery was a beer brewing company established in 1840 in St. Louis, Missouri that was acquired by the Griesedieck Beverage Company in 1920, which subsequently became the Falstaff Brewing Corporation.  The brewery complex property consists of 27 buildings on a 13.7 acre site in the Marine Villa neighborhood.  St. Louisian Steve DeBellis has been the owner of the Lemp Brewing Company trademark since 1988.

Supporting paragraphs: Lemp Mansion Falstaff Brewing Corporation
Answer: 1838