Julius "Jules" de Mun (1782–1843) was a 19th-century French-American fur trader.
Early life De Mun was born in Port-au-Prince, Saint-Domingue to an aristocratic family originating from the Southwest of France. He was educated in Paris, before moving to St. Louis in 1800.
Trading career In September 1815, de Mun went with Auguste Pierre Chouteau and his brother Pierre Chouteau Jr. to the Rocky Mountains on an expedition, to trade horses with the Arapahos and Comanche tribes. After a while, however, the trade began to dwindle and they ceased operations. While trading in Mexico, de Mun was imprisoned alongside A. P. Chouteau for 48 days in Santa Fe, leading the group to file a claim against the Mexican government for confiscated goods worth $30,000.Hafen, p. 30. Retrieved 19 July 2018. Payment for the claim was not obtained until 1851, through an act of Congress.Hafen, p. 46. Retrieved 19 July 2018.
In 1817, de Mun opened a trading business with Auguste Pierre Chouteau in St. Louis, known as A. P. Chouteau, de Mun & Co., or Chouteau, De Mun & Sarpy. On 14 September 1818, de Mun dropped out of the business.Hafen and Lecompete, p. 104. Retrieved 19 July 2018.
Post-trading career and death In 1820, de Mun moved with his family to Cuba, where he had purchased a large coffee plantation. They returned to St. Louis in 1831 and De Mun was made recorder of deeds for the county. De Mun died in 1843, leaving his property to his wife.Hunter, p. 27. Retrieved 19 July 2018.
Family In 1812, de Mun married Isabella Gratiot, the daughter of Charles Gratiot Sr. and Victoire Chouteau and the granddaughter of Pierre Laclède, the founder of Saint Louis (Missouri); they had three daughters.
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