If some of your ancestors lived along the south shore of the Lower St. Lawrence River (the Bas Saint-Laurent, as it is often called today,) the attached PDF compilation is designed to help you learn more about their lives.
See PDF: Seigniories of the Lower St. Lawrence – Revised Version 2018-09-03
The river is tidal here, and so broad that the far north shore is hardly visible. This beautiful area of rolling farmland and salt marshes has been settled for generations, with many residents making a living fishing, building boats and transporting goods and people on the river.

Until the 1850s, almost all the land was owned by a few individuals, known as seigneurs, who rented it out to the censitaires, or tenant farmers. Most seigneurs were honest and caring individuals who took care of their tenants. They granted lands to the settlers and financed their first years with money, food, cattle and other animals, farm equipment, wood-cutting tools, building tools and rifles.
In return, the censitaires would repay on a yearly basis their seigneur with beaver furs and other types of fur. They also repaid them with hard-wood, a precious commodity in the 17th century in Europe, for most hard-wood forests no longer existed on the European continent. If the seigneur and his family resided on the seigneury, the censitaires would bring them eggs and meat, as well as fresh milk.

Many of the seigneurs on the attached list were merchants or fur traders, and obtained most of their revenue from the sale of wild furs and hard-wood. Some were importers and exporters and dealt with merchants in French port cities such as La Rochelle, Bordeaux, Rouen and Le Havre.
The compilation on the PDF attached includes six main sections:
The Seigneurs: this section focuses on the historic landowners on the south shore of the Lower St. Lawrence, including links to biographies of these individuals.
Regions: the geographic regions described in this compilation are Montmagny, l’Islet, Kamouraska, Témiscouata, Rivière-du-Loup, Les Basques, Rimouski, Neigette, La Mitis (Métis), Matapedia and Matane in the Gaspé.
Cemeteries: a list of historic cemeteries in this area.
Notaries: this compilation includes the names of notaries who worked in this region, the places and years they practised, and the archives where their acts can be found today. The notaries handled important legal documents for people, including wills, marriage contracts, business agreements, land rental and sales agreements, and protests in cases of disagreement.
Bibiothèque et Archives nationales du Québec (BAnQ): locations and contact information for the archives, and how to order documents online.
Genealogical and historical societies in the region: contact information
With regard to the notaries listed in the attached PDF, the majority of the notarial acts can be obtained through the BAnQ online (free, http://bibnum2.banq.qc.ca/bna/notaires/ or http://www.banq.qc.ca/archives/genealogie_histoire_familiale/genealogie_banq/guide/archives-notariales/index.html), FamilySearch.org (free), or Ancestry.com (subscription). Ancestry has two distinct databases covering different time periods during the lifetime of a notary. Also listed are the notarial acts which can be obtained through Généalogie Québec (Drouin Institute online), (https://www.genealogiequebec.com/en/.
For each notary selected, if a URL address has been posted, this indicates that the genealogy provider’s online databases contains notarial acts. If a URL address has not been posted, this simply indicates that the provider does not own fonds of this particular notary.