1823
1823 — Rev. Eleazar Williams, in the employ of the Episcopal Missionary Society, started a school of white and half-breed children on the west side of Fox river, opposite " Shanty-Town."
The regionGrade A · 1 independent source
The evidence
“The early Jesuit missionaries, and — subsequently to 1816, when it came under the military control of the United States — representatives of various other religious denominations, sought to teach the Indian tribes of this section. In 1823, Rev. Eleazar Williams, well known for his subsequent claim to be the Dauphin of France, and who was in the employ of the Episcopal Missionary Society, started a school of white and half-breed children on the west side of Fox river, opposite " Shanty-Town." A Catholic mission school for Indians was organized by an Italian priest near Green Bay, in ^830.”
1879-history-of-rock-county/03-wisconsin-topography-geology-agriculture.md, PDF p. 136
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources