It has been difficult to trace the line of descendants of this founder of Prairie du Rocher. In a document of December 30, 1740, we learn that the late Ettienne Langlois married Catherine Beaudrau, a widow, and had the following children; Marie Louise, who married Pierre Messenger; Marie Josefine, m. Louis Populus sieur de St. Photes; Toinette, m. Pierre Boucher de Monbrum sieur de Soudray; Francois, Louis, Girard, Perine and Auguste. These last five were minors. From other sources it is learned that Ettienne had two brothers, August who lived at Kaskaskia, and Louis. What relation the notary Pierre Langlois
The father of Henry Ker, a leading farmer in the neighborhood of Prairie du Rocher, was a man than whom few have seen more varied vicissitudes or left lives of more remarkable adventure. His name, like that of the subject of our biography, was Henry Ker, and he was born at Boston, Massachusetts, the son of English parents, who were temporarily residing at that place. He lived but a short time in Massachusetts. The family moved back to London where Henry received his education. He seems to have been born with an adventurous disposition, and habits of personal courage and
The oldest resident in the town of Prairie du Rocher is John N. Louvier, who was born in the village, in the year 1802, and has since lived in the town or in the vicinity. His father was Antoine Louvier, a Frenchman, who came to Illinois country when a boy. Antoine Louvier was born about the year 1767, and was ten or fifteen years of age when he came to Randolph County. He married Louise Langlois. The Langlois family was one of the earliest and most influential in the community, the first of which to come to Prairie du Rocher
St. Joseph Church Prairie du Rocher, Illinois, was established in 1722 as a chapel dependent upon the royally endowed church of Ste. Anne at Fort Chartres. King Louis XIV of France had dreamed of a great French empire in Mid America, but died before he could bring his dream to reality. Following his death in 1715, the regent, Philip of Orleans, ruling for the boy King Louis XV, commissioned Pierre Duque Boisbriant to found Fort Chartres in 1718 on the mighty Mississippi, midway between Quebec and New Orleans, to be the capital of the new French empire in Mid America.
In 1828 the transfer of the British garrison from Drummond Island to Penetanguishene commenced. A list of voyageurs who resided on Drummond Island at the time of the transfer. In many cases a brief biographical sketch is contained which may provide clues to their ethnicity, family relationships, and the location where they or their ancestors settled.