US 1860 Census includes entry for Nancy Lines Dennis.

Date: Aug 30, 1860
Type: Government Document
Source: United States Census Bureau
Non-LDS
Hearsay: Direct
Reference: Nancy Dennis, Utah Territorial Census Schedule 1 for Utah County, 1860, FamilySearch
Scribe/Publisher: United States Census Bureau
People: Nancy Lines Dennis, United States Census Bureau
Audience: Reading Public
Transcription: Nancy 48 [age] ... servt [occupation]
Source Link: https://www.familysearch.org/ark:/61903/3:1:33SQ-GBS8-9R5X?view=index&action=view&personArk=%2Fark%3A%2F61903%2F1%3A1%3AMH2W-7G3
Citations in Mormonr Qnas: Slavery in Utah
Black Saints and the Priesthood (Brigham Young/Early Utah era)
Black Saints and the Priesthood (1895–1978)