Following the Canadian connection.

Prime Olivier’s original baptism

The original Sainte-Anne-d’Yamachiche register, entry B.142, records Prime Olivier, born and baptized 16 November 1844, legitimate son of Jean Baptiste Duplessis, farmer, and Christine Placide Lefebvre Denoncour. The father’s signature appears at the bottom of the entry.

The exact uncommon two-part name appears in reverse order in the original 1892–93 Oswego directory as Oliver Prime Duplessis. The year agrees with the 1870 and 1875 New York records. American evidence places his birth in Québec, reports migration in 1860, and follows the Canada-born miller through Syracuse, Baldwinsville and Oswego. Older members of the same candidate family were already established in Syracuse.

Open the full-resolution original baptism · BAnQ register viewer

The American name trail

The original 1870 Syracuse census records Prime Duplisse, 26, a Canada-born flour miller, with Sarah and two-year-old James. A 1875 Onondaga census index names Oliver Dupliscis, born 1844, with spouse Sarah. In 1880, Prime was a Québec-born miller in Oswego with Sophrona and children. The 1892–93 directory then prints his full name, Oliver Prime Duplessis, at 60 East Seneca Street. An 1899 directory places his widow Sophronia and daughter Emma at that address.

Original 1870 Syracuse census · Original 1880 Oswego census · Original 1892–93 directory · Original 1899 directory

The parents and Syracuse relatives

The 1900 Les vieilles familles d’Yamachiche lists Prime among the children of Jean-Baptiste Duplessis and Christine-Placide Denoncourt. The original 1851 Pointe-du-Lac census places Jean-Baptiste, Christine and eight-year-old Prime in one household. The original baptism now independently confirms the parent pair and supplies Prime’s second name, Olivier.

The same genealogy lists older brothers Jean-Odilon and Cyriac. An Onondaga naturalization index records Odilon in 1855 and 1859. A 1909 diocesan history names Odilon as a pioneer of Syracuse’s French Catholic congregation in 1869, immediately before Prime appears there. This collateral migration trail supports the Canadian-to-American identification.

Original 1851 household · 1900 Yamachiche genealogy · Odilon naturalization index · Syracuse church history

How far the Duplessis line currently reaches

Through the strongly supported Prime Olivier identification, the surname line runs through Jean-Baptiste Duplessis and Christine-Placide Denoncourt, then Jean-Baptiste’s parents Isidore Duplessis and Marie-Émilie Rouette, and earlier Québec couples to Jean-Baptiste dit Duplessis, who married Françoise LaCerte in 1740.

Raymond Douville’s archival study shows that the 1740 marriage contract described Jean-Baptiste’s parents as unknown. It rejects the older printed Gastineau ancestry. A possible identification with a Mascoutin boy baptized at Detroit in 1714 remains only a hypothesis, so the defensible surname line stops with the 1740 groom until more evidence appears.

Read the archival study · Read the evidence analysis

Sophronia Béchard’s Québec family

Sophronia’s original 1931 notice names her sister Mrs. Marie Daigneault of Woonsocket. Marie’s 1944 notices identify her as Marie Béchard Daignault, born 21 August 1854 at Saint-Jean-d’Iberville, Québec. PRDH indexes Marie Philomène Béchard on that exact date and Marie Josèphe Sophronie Béchard in 1853, both children of Lucien Béchard and Sophronie Archambault. This identification is highly probable; the original baptism pages still need inspection.

Sophronia’s notice · Marie’s death notice · Béchard–Archambault marriage compilation

What remains to prove

1. Find an American death, marriage or naturalization record that explicitly names Oliver Prime’s parents.
2. Inspect the original 1853 Sophronie and 1854 Marie Philomène Béchard baptisms.
3. Find Sophronia’s marriage or death record naming her parents.
4. Continue collateral research on Jean-Odilon and Cyriac for a record explicitly calling Prime their brother.