It has been suggested Clemence was the daughter of Jean Baptiste Florimond Rouvillain & Marie Opron; this does not appear to have been substantiated.
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ65-X5F : 19 February 2021), Clemence Monsanto in household of H M Monsanto, New York, New York, New York, United States; citing enumeration district ED 471, sheet 584B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,889.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSNR-SZ2 : accessed 24 February 2021), Clemmons Monsanto, Borough of Brooklyn, Election District 7 New York City Ward 30, Kings, New York, United States; citing enumeration district (ED) 559, sheet 23B, family 491, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,069.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M5SM-R1R : accessed 24 February 2021), Clemence Monsanto, Brooklyn, Kings, New York, United States; citing enumeration district (ED) ED 1076, sheet 5B, family 97, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 985; FHL microfilm 1,374,998.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:24HW-RPP : 10 February 2018), Clemence De Rouvillain in entry for Ludovie M. Monsanto and Alice R. Monsanto, 04 Jun 1887; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,671,683.
"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:27YY-519 : 11 February 2018), Clemence Rouvillaine in entry for Louise Monsento, 21 Aug 1869; citing Manhattan, New York, New York, United States, reference v 19 p 347 New York Municipal Archives, New York; FHL microfilm 1,315,317.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:24SK-N7Q : 10 February 2018), Clemence Terresse Rouvillian in entry for William Heyer and Julie Carrin Monsanto, 30 Dec 1885; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,570,675.
New York, Kings County, Probate Records; Author: New York. Surrogate's Court (Kings County); Probate Place: Kings, New York
Ancestry.com. New York, New York, U.S., Extracted Death Index, 1862-1948 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.
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