Jacques-Timothée Boucher, Sieur de Montbrun (/dəˈmʌmbriən/; 23 March 1731 – October 1826), anglicized as Timothy Demonbreun, was a French-Canadian fur trader, a Lieutenant in the American Revolution, and Lieutenant-Governor of the Illinois Territory.
After his country, France, was beaten in the Battle of the Plains of Abraham in Canada in 1759, Jacques-Timothee Boucher at the age of 28 migrated south to the British colonies, what became the United States, and got into the fur trade.
Preferring the simple life of a trapper and hunter, he dropped the noble title, adapting it in an anglicization as his new surname, Demonbreun.
Demonbreun made frequent trips to the early Nashville settlement to engage in fur trading with local Native Americans.
When James Robertson and the Watauga settlers established Fort Nashborough in 1778, they were surprised and relieved to find that Demonbreun, a white man, was thriving there.
During his time in Nashville, he took a common-law wife named Elizabeth Bennett and had three children by her: Polly (Cagle); William; and John Baptiste Demonbreun, who was born in a cave on the banks of the Cumberland River.
By 1800 his mercantile business on Nashville's Public Square advertised such items as window glass, paper, cured deer hides, and buffalo tongues.
In 1996 a monument sculpted by Alan LeQuire to honor Demonbreun was erected near Fort Nashborough, overlooking the Cumberland River in downtown Nashville.
A monument has been erected in honor of Timothy Demonbreun at Carney Cemetery in Ashland City, Tennessee, but historians do not believe he was buried there.