Catherine is named in her father Peter Mantz's 1828 will. Her husband John Markell is also named as Peter's son-in-law, though the will doesn't state that he's Catherine's husband.[2]
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD4F-9Q5 : 9 November 2014), Catharine Markell in household of John Markell, Fredericktown, Frederick, Maryland, United States; citing family 200, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Jacob Engelbrecht, ed. Edith Olivia Eader and Trudie Davis-Long. The Jacob Engelbrecht Death Ledger of Frederick County, MD 1820-1890. Paw Prints, Inc., Monrovia, MD, 1995. #6105.
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