October 10, 1858
Rev. Oliver Bronson was chosen pastor of the Beloit church, and installed October 24.
BeloitGrade A · 1 independent source
The evidence
“At that date the membership of the church had more than quadrupled, being then fifty-three. Mr, Staples continued pastor till the summer of 1858. He subsequently served in the pastorate at Kankakee, 111., and as secretary of the Virginia Bible Society, dying September 3, 1892, at Catskill, N. Y. On October 10, 1858, the Rev. Oliver Bronson was chosen pastor and installed on the 24th day of the same month.”
1908-brown-rock-county/14-janesville-churches.md, Vol. 1, PDF p. 312 / book p. 286
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