The territorial era of Minnesota lasted from the Louisiana Purchase in 1803 to Minnesota's achieving statehood in 1858.
 The Minnesota Territory itself was formed only in 1849 but the area had a rich history well before this.
 Though there was a long history of European presence in the area before 19th century, it was during the 19th century that the United States began to establish a firm presence in what would become Minnesota.
Martin McLeod (April 13, 1813 – November 20, 1860) was an American fur trader, pioneer, and territorial legislator.
Joseph Rolette (23 October 1820 – 16 May 1871) was a well-known American fur trader and politician during Minnesota's territorial era and the Civil War.
 His father was Jean Joseph Rolette, often referred to as Joe Rolette the elder, a French-Canadian and a trader himself.
 Joseph Rolette’s mother was Jane Fisher, who married Joe Rolette, Sr. in 1818 when she was either 13 or 14 years old.
 Jane's relatives took young Joseph to New York.
 Joseph's parents never divorced as they were Catholics, but the couple became separated in 1836.
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 As part of the settlement, Joe Senior built what is today known as the Brisbois House for his estranged wife on Water Street, St. Feriole Island, Prairie du Chien, WI.
Hypolite Dupuis (October 16, 1804July 1879) was a fur trader with the American Fur Company.
 He was born in LaPrairie de la Madeleine, near present-day Montreal in lower Canada.
 By 1831 he had moved to what would become the Minnesota Territory to work at Joseph Renville’s Lac qui Parle trading post.
 He moved to Mendota, Minnesota around 1840 and built a house on the property of Henry Hastings Sibley.
 Dupuis worked as a clerk for Sibley and managed the company store.
 He married Angelique Renville, daughter of Joseph Renville, and they had eight children.
Russel Farnham (1784 – October 23, 1832) was an American frontiersman, explorer, and fur trader.
 An agent of John Jacob Astor's American Fur Company, he oversaw fur trading in the Great Lakes region throughout the 1810s and 1820s.
 A member of the Pacific Fur Company headed by Wilson P. Hunt during 1810–1812, he is also the first American to semi-circumnavigate the world traveling by foot from Fort Astoria (now Astoria, Oregon) to St. Petersburg, Russia, to New York City.
Robert Stuart (February 19, 1785 – October 28, 1848) was a Scottish-born American fur trader best known as a member of the first European-American party to cross South Pass during an overland expedition from Fort Astoria to Saint Louis in 1811.
 He was a member of the North West Company (NWC) until recruited by John Jacob Astor to develop the new Pacific Fur Company, which was based at Fort Astoria, on the coast of present-day Oregon.
 Astor intended the venture to develop a continent-wide commercial empire in fur trading.
Francois Payette (b.1793 – d. post 1844) was a North American fur trader. Born near Montreal, he began his career as a canoeman, was hired by John Jacob Astor and shipped to the Oregon Country aboard the "Beaver", entering the mouth of the Columbia River on May 9, 1812.
 With the sale of Astor's Pacific Fur Company to the North West Company in 1813, Payette joined the NWC, "accompanying numerous expeditions into the interior."
 When the Hudson's Bay Company absorbed the North West Company in 1821, Payette transferred allegiance to the HBC.
 He took part in notable fur gathering-trading expeditions throughout the upper Rockies and was an occasional interpreter, sometimes second in command of brigades, and clerk.
The Sibley Historic Site is the site of Henry Hastings Sibley's home, who was the regional manager of the American Fur Company and Minnesota's first governor.
 It is one of the 26 historical sites that are operated by the Minnesota Historical Society.
 Located in what is now the city of Mendota, the site consists of four limestone buildings and a large lawn area.
 Three of the buildings are open for touring, including a fur company cold store from 1843 and the 1840 home of fur trader and hotelier Jean-Baptiste Faribault.
William Henry Forbes (1815 – July 20, 1875) was an American fur trader and territorial legislator.
Theophile Bruguier (August 31, 1813 – February 18, 1896) was a French-Canadian fur trader with the American Fur Company.
 Bruguier is credited as being the first white settler of what would become Sioux City, Iowa.

Question: What is the name of the well-known American fur trader and politician during Minnesota's territorial era and the Civil War?
Answer: Joseph Rolette