1843
A man came to Wisconsin and located and purchased 260 acres at La Prairie.
Rock CountyGrade A · 1 independent source
The evidence
“P. 0. Janesville; born in Somersetshire, England, in 1823 ; came to Wisconsin in 1843, where he located and purchased 260 acres at La Prairie, his present homestead ; he then went to New York, and returned with his father in 1847. Married, in 1867, Miss Rhoda Blunt, a native of Walworth County, Wis. ; has six children — Naomi, born April 3, 1868 ;”
1879-history-of-rock-county/26-bios-la-prairie.md, PDF p. 832
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