Louis Antoine Juchereau de St. Denis (September 17, 1676 – June 11, 1744) was a French-Canadian soldier and explorer best known for his exploration and development of the Louisiana (New France) and Spanish Texas regions. He commanded a small garrison at Fort de la Boulaye on the lower Mississippi River, built in 1700, and founded Fort St Jean Baptiste de Natchitoches in northern La Louisiane, as they called the French colony.
Early life and education
St. Denis was born at Beauport, New France (Quebec), the eleventh of the twelve children of Nicolas Juchereau (1627-1692), Seigneur du Chesnay and Saint-Roch-des-Aulnaies; member of the Sovereign Council of New France. His paternal grandfather was the elder brother of Noël Juchereau des Chatelets. His mother, Marie Thérèse Giffard de Beauport, was the daughter of Robert Giffard de Moncel, Sieur de Moncel à Autheuil, and the 1st Seigneur of Beauport, Quebec. His brother was the grandfather of Louis Barbe Juchereau de Saint-Denys (1740-1833), 1st Marquis de Saint-Denys, ancestor of Marie-Jean-Léon, Marquis d'Hervey de Saint Denys.
By decision of his parents, St. Denis emigrated temporarily to France to acquire a higher level of education. In late 1699, St. Denis joined the second expedition of Pierre Le Moyne, Sieur d'Iberville (his first cousin), which departed from La Rochelle and travelled to Louisiana. St. Denis commanded a small garrison at Fort de La Boulaye, named for a commune in the Bourgogne region of France. The fort was constructed in 1700 on the Mississippi River about 20 kilometers below the future development of New Orleans; it was designed to protect French interests against the Spanish and English in the region. St. Denis also commanded a fort at Biloxi Bay, where the French founded another settlement. St. Denis also explored to the west of the bay and up the Mississippi River, where he journeyed to the lower Red River. These expeditions to the northern areas allowed him meet the Karankawa and Caddo tribes, from whom he learned wilderness skills specific to the area.
In September 1713 Antoine Laumet de La Mothe, Sieur de Cadillac sent St. Denis and a group of French marines from Mobile to the Red River, where they established a French outpost and fort. The intent was to protect the territorial boundaries of French-Louisiana and halt the eastward expansion of the Spaniards, whose local government was based on the Rio Grande in south Texas. The Spaniards were building Fort Los Adaes about 15 miles west of Natchitoches, near the present town of Robeline, LA. St. Denis arrived in central Louisiana at what is now Natchitoches later in 1713 and built Fort St. Jean Baptiste de Natchitoches as a trading post along the banks of the Red River, whose course later changed and the result became the Cane River. He traded with the Caddo Nation there and freely sold them guns; additionally, St. Denis developed a somewhat friendly relationship with the nearby Spaniards, despite the objections of the French governorship. St. Denis and his men learned many hunting and trapping skills from the Caddo Indians, who were welcoming and friendly. St. Denis became fluent in the Caddo language, as well as the fictive kinship relationships that supported peace and trade.
Soon after founding Natchitoches in 1714, St. Denis went to the territory of the Hasinai Confederacy, a group of Caddoan language tribes. After leaving these lands, Denis traveled to the Rio Grande, where visited the Spanish outposts located along the river. However, Commander Diego Ramón captured Denis and arrested him at San Juan Bautista, Coahuila for having violated Spanish trade "restrictions". He confiscated his goods while waiting for the Mexico City authorities to decide how a foreigner with such charges should be treated. In the meantime, St. Denis courted the Ramón's step-granddaughter, Manuela Sanchez-Navarro, a descendant of the conquistadors of the provinces of Nueva Vizcaya and Nuevo León, Mexico, and got her to promise to marry him. Following the orders of Mexico City, Ramon ordered him to go to that city to stand trial. However, St. Denis managed to defend his case and the city authorities suggested him to lead the Domingo Ramón expedition to East Texas, whose purpose was the founding of missions, with the title of commissary officer.