1841
Mr. Willard was in Beloit, living for a time in the house of Samuel B. Cooper.
BeloitGrade A · 1 independent source
The evidence
“Mr. Willard was in Beloit as early as 1841, and for a time lived in the house of Samuel B. Cooper, Esq., on School street ; later Mr.”
1908-brown-rock-county/06-history-of-beloit.md, Vol. 1, PDF p. 183 / book p. 166
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources