This map shows the seigneury of Batiscan in 1709
On the far right where the Batiscan River flows into the St Lawrence River one sees a land concession belonging to a St Marc.  This land belonged to Louis Guillet dit St Mars.  It still belongs in the family!!
1657 - 1730
1668- 1739
Louis Guillet was born in Trois Rivières on June 4th 1657.  He was the sixth child, second son of Pierre Guillet dit Lajeunesse and Jeanne Saint Pere.  In 1660 at the age of 3, Louis received from his godfather, Claude Houssard dit le petit Claude a donation of 50 pounds.  Claude was the husband of Madeleine Couteau, his maternal grandmother.  Louis spent his early years at Cap de la Madeleine.  In 1666, his father obtained one of the first land concessions in the Batiscan River valley. 
At the age of 13 on February 25th 1671 (notary - Jean Cusson), he obtained, with his father, land on Cote Saint-Marc.   Louis and his older brother Mathurin acquired land in Batiscan on May 7th 1682.  On January 21th 1686, he purchased on his own, more land here.  At the age of 27, he married Marie Trottier on January 18th 1684 in the church of Saint Francois Xavier of Batiscan.  She was the daughter of Jean Baptiste Trottier and Genevieve de Lafond.
Ten years later he started in the fur business with his brother, Mathurin and other associates.  He travelled to the Outaouais and the Abitibis and according to one source also delivered merchandise in Martinique in the Carribeans.  On June 13th 1695 the "Compagnie Royale" was formed.  Its mandate was to trade with the Native tribes in the Abitibi, Témiscamingue region.  Among the company were Jean-Baptiste Crevier dit Duvernay, Robert Rivard dit Loranger (married to Louis's sister, Madeleine), Jean Trottier, Jean Baribault , Jean Desrosiers dit Dutremble and Louis Guillet.  Four months later on October 15th he sold his partnership rights to his uncle, Nicolas Rivard dit Lavigne. 

Louis took the name of St Marc in 1692 and St Mars in 1718.

When his father passed away, his stepmother, Madeleine Delausnais transferred on July 7th 1698 an annual income from the inheritance to Louis. In October of the same year Louis transferred an annual income of his brother-in-law, Jean Baril, widower of his sister, Marie.

Louis and Marie spent their lives in Batiscan.  All their children were born and baptized here.

1.Marie-Madeleine Guillet, b. 1686, Batiscan, QC.
2.Marie-Louise Guillet, b. 1687; m. Ignace Guyon, January 12,
  1704/05, Ste Genevieve de Batiscan, QC.
3.Marie-Catherine Guillet, b. July 26, 1689, Batiscan, QC; d.
         June 22, 1752; m. Jean Baptiste Adam, April 16, 1708, Ste
         Genevieve de Batiscan, QC.
4.Marie-Jeanne Guillet, b. January 26, 1690/91, Batiscan, QC; m.
          Jean Baptiste Guyon, August 25, 1718, Batiscan, QC.
5.Marie-Madeleine Guillet, b. November 09, 1692, Batiscan, QC;
  m. René Messier, August 25, 1718, Batiscan, QC.
6.Elisabeth Guillet, b. August 22, 1694, Batiscan, QC; m. Joseph Guyon,
  March 03, 1709/10, Batiscan, QC.
7.Louis Guillet, b. June 17, 1696, Batiscan, QC; d. September 04, 1759,
  Verchères, QC; m. (1) Marguerite Tétreau, August 08, 1718,
  Contrecoeur, QC; m. (2) Francoise Normandin, June 22, 1733,                 
  Verchères, QC.
8.Marie-Josephte Guillet, b. Abt. May 06, 1698, Batiscan, QC;
  d. September 19, 1712, Batiscan, QC.
9.Joseph Guillet, b. April 18, 1700, Batiscan, QC; d. Bef. 1765; m. (1)
  Angelique Lepelle dit Lahaye, September 21, 1726, St Francois
  Xavier, Batiscan, QC; m. (2) Josephte-Genevieve Rivard-
  Lanouette, February 17, 1754, Ste Anne de la Perade, QC; b. May
  25, 1734, Ste Anne de la Perade, QC; d. April 07, 1790, Batiscan, QC.
    10.Marie-Angelique Guillet, b. August 01, 1702, Batiscan, Quebec; m.
  Etienne Biguet, April 16, 1719, Batiscan, QC.
    11.Jean-Baptiste Guillet, b. January 25, 1704/05, Batiscan, QC; d. July
  22, 1786; m. Marguerite Roy, February 09, 1727/28, Ste Anne de la
  Pérade, QC; b. 1705; d. May 07, 1788.
    12.Marie-Anne Guillet, b. December 09, 1711, Batiscan, QC; d. June
  22, 1714, Batiscan, QC.

Louis Guillet dit St Mars was made the church warden of St Francois Xavier de Batiscan in 1706 and again in 1720.  He was there at the time of the first and second church of Batiscan.  In trying to determine the appearance of the first small church, one of Louis's reports during his first tenure, helps by stating:

"The rent of the church benches, the votive offerings were paid in wheat
except for those where it is marked they paid in cash.  And one finds in
the attic of the church, ninety six minots of wheat, which were bought
and sold at 4 sols per minot, as is shown in the receipt book below."

This lets us know that the small chapel had an attic that was not actually used by the parishioners but was used as a storage area.

In 1724, Louis and Marie willed all their wordly goods to their children.
Louis Guillet dit St Mars passed away in Batiscan on March 6th 1730 at the age of about 73.  He was buried in the parish cemetery.  On May 12th 1739 Marie, in the presence of the notary Pollet, dictated a will.  She asked that her son, Jean Baptiste be responsible for 50 masses to be given for the repose of her soul.  He should inherit her household goods. Her son, Joseph Guillet, Captain of the Militia for Batiscan was named executor of the will.  Marie was unable to sign due to a hand injury. She died  a month later on June 24th 1739 and was buried with Louis.

Sources:

1.Le Nouvelliste: samedi 6 septembre 1980

2. "Genealogie des Familles Cinq Mars et Guillet"  by Roland Cinq Mars, Rougemont, PQ. the following:   His descendants still have this land today.

3. Various notarized  actes pertaining to him.

LOUIS GUILLET DIT ST MARC (1657 - 1730)

the son of Pierre Guillet dit Lajeunesse and Jeanne Saint Pere resided in Batiscan. This is a record of events in his life through existing church records, census and notarized acts.

June 4 1657 Trois Rivières
Baptism
Godfather: Claude Houssard
Godmother: Judith Rigault

November 19, 1660 Trois Rivières
Ameau dit Saint-Sévérin, S.:
Donation of a sum of money by Claude Houssart of Cap de la Magdelaine to Jeanne Rivard, Louis Guillet and the parish of Ste Marie of Cap de la Madeleine.
(damaged)

February 25, 1671 Trois Rivières
Cusson, J.:
Sale of land concession situated along the Saint Laurens by the Company of  Jesus to Louis Guillet and Pierre Guillet dit Lajeunesse, his father.
(damaged)

December 18, 1681 Trois Rivières
Roy de Chatellereault, M.:
Association between Mathurin and Louis Guillet.

April 6, 1682 Montreal
Adhémar dit Saint-Martin, A.:
Agreement between Mathurin and Louis Guillet, brothers and Francois Frigon of Batiscan.

May 30, 1682 Montreal
Maugue, C.:
Agreement between Mathurin Guillet, Louis Guillet and ? Rivard of Batiscan and Jean Baptiste de Peyras, Jacques Gourdo de Quebek and Jean Rougeot dit Bergé of the seigniory of Ste. Anne associates for the voyage to the Outaouais.

January 18, 1684 Montreal
Adhémar dit Saint-Martin, A.:
Marriage contract between Louis Guillet (age 26) son of Pierre Guillet and of the late Jeanne Semper of Batiscan and Marie Trotier (age 16) daughter of Jean Trotier and of Geneviève  L'afon of Batiscan.

January 25, 1684 Montreal
Adhémar dit Saint-Martin, A.:
Discharge by Marie Chamois and Francois Frigon, her spouse, presently absent from Batiscan to Mathurin Guillet and louis Guillet, his brother.
(Note: the document was also worked on by the notary Sévérin Ameau)

February 21, 1684 Quebec
Rageot, G.:
Power of attorney between Mathurin Guillet of Batiscan as much for him as for Louis Guillet of Batiscan, his absent brother and associate and Marie-Anne Chamois, wife of Francois Frigon of Batiscan.

May 23, 1695 Trois Rivières
Trottain dit Saint-Seurin, F.:
Proxy of Robert Rivard, Jean Moreau and Louis Guillet of Batiscan to Jean Baril of Batiscan.

June 13, 1695 Montreal
Basset dit Deslauriers, B. :
Agreement between Jean Baptiste Crevier dit Duvernay of Batiscan, Robin Rival dit Loranger of Batiscan, Louis Guillet of Batiscan, Jean Trottier of Batiscan, Jean Baribault of Batiscan and Jean Desrosiers dit Dutremble of Champlain all associates in the Compagnie Royale.

June 14, 1695 Trois Rivières (June 12, 1695)
Cusson, J.:
Sale of a land concession on the Cap de la Madeleine on a site commonly known as Cote St Marc by Jean Baril, widower of Marie Guillet for and on behalf of his children and with power of attorney for Louis Guillet, Robert Rivard and Madeleine Guillet, his wife, Jean Morau et Anne Guillet, his wife, Catherine Guillet and Sebastian Provencher, her husband of the Cap de la Magdalenne, Pierre Dehaye and Marguerite Guillet, his wife and Pierre Chanpuu and Genevieve Guillet, his wife of Becencour to Louis Provencher of the Cap de la Magdalenne.

October 15, 1695 Quebec
Chambalon, L. :
Sale of partnership rights in the Company created to trade with the Abitibis natives, by Louis Guillet of Batiscan to Nicolas Rivard of Batiscan.

July 7, 1698 Trois Rivières
Trottain dit Saint-Seurin, F.:
Transfer of the annual and perpetual income by Madeleine Delausnais, widow of Pierre Guillet de Lajeunesse of the Cap de la Magdelaine to Louis Guillet de St. Marq of Batiscan.

October 8, 1698 Quebec
Genaple de Bellefonds, F.:
Transfer of the annual income by Louis Guillet de St. Marc of Batiscan to Jean Baril de Batiscan.

January 11, 1705 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Ignace Guion (age 25) son of  Joseph Guion and of Geneviève Cloustie, of the parish of St. Charle des Roche and Marie-Louise Guillet (age 18) daughter of Louis Guillet and of Marie Trotié, of Batiscan.

April 14, 1708 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Jean-Baptiste Adam (age 25) son of Jean-Baptiste Adam royal notary and of Marie de Meserais of the parish of Baumont and Marie-Catherine Guillet (age 19) daughter of Louis Guillet de St. Marq and of Marie Trotier, of Batiscan

March 1, 1710 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of land situated in the Seigniory of the Company of Jesus by Louis Guillet de St. Marq and of Marie Trotié, his wife of Batiscan to Jean-Baptiste Adam their son-in-law.

March 1, 1710 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Joseph Guion (age 27) son of Joseph Guion and of Geneviéve Cloustié; and Elisabeth Guillet (age 16) daughter of Louis Guillet de St. Marq and of Marie Trotié, of Batiscan

July 4, 1712 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of  parts of a land concession in the seigniory of the Company of Jesus by Louis Guillet de St. Marq and Marie Trotié, his wife of Batiscan, Jean Danderelot and Madeleine Trotié, his wife of Batiscan, Antoine Germaine and Elisabeth Trotié (minor), his wife of the Seigniory of Pordneuf and Jean Trotié of St. Charles des Roche in the name of and as procurator of ?, Sister St-Joseph, sister of the Congregation, his sister to Antoine Trotié their brother.
(damaged)

April 18, 1714 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of  a land concession in the seigniory of St Pierre opposite Batiscan by Clément Dubois and Marie-Anne Joint, his wife of the seigniory of St Pierre opposite Batiscan to Louis Guillet son of Louis Guillet de St. Marq, his father acting for him.

February 5, 1715 Quebec
Rivet dit Cavalier, P:
Agreement and transaction between Louis Guillet dit St Marq and Francois Rivard dit Lacoursière de Batiscan.

August 24, 1718 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between René Mesier-Duchaine from Cap St Michel, widow of Catherine Bisonnet and Marie-Madeleine Guillet (age 25), daughter of Louis Guillet de St Marq and of Marie Trotié, de Batiscan.

August 24, 1718 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Jean-Baptiste Guion, son of the late Joseph Guion and of Geneviève Cloustie de Verchaire and Marie-Jeanne Guillet (age 27) daughter of Louis Guillet dit St Marq and Marie Trotié de Batiscan.

April 13, 1719 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Etienne Bigué dit Nobert, son of the late Etienne Bigué and of Dorothée Dubois de Batiscan and Marie-Angélique Guillet (age 17) daughter of Louis Guillet dit St Marq and Marie Trotié de Batiscan.

July 8, 1721 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of  two land concessions situated in the Seigniory of Ste Anne by Thomas de Lanauguere de Laperade  to Jean-Baptiste Guion dit Lachapele of Cap St Michel who is absent. Accepting for him his father-in-law, Louis Guillet dit St Marq.

March 5, 1722 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of land in the Seigniory of St Pierre, across from Batiscan, by Louis Guillet de St Marq of Batiscan in the name of his son Louis Guillet de Verchaire to Francois Brison of the Seigniory of St Pierre.

May 15, 1722 Trois Rivières
Normandin, D.:
Sharing of a land concession situated on the Batiscan river between Marguerite Cosset and Jean Baribaut, her husband of Batiscan , Louis Guillet-St. Marc and Luc Proto of Batiscan in compliance with an ordinance from the Lieutenant General of Trois Rivières.

June 7, 1723 Trois Rivières
Trottain dit Saint-Seurin, F.:
Sale of land in the Seigniory of St Pierre, across from Batiscan, by Louis Guillet de St Marq of Batiscan to Jean-Baptiste Grognié of St Charles à la Petite Rivière near Quebecq.

February 17, 1724 Trois Rivières
Normandin, D.:
Donation of land by Louis Guillet-St. Mar and Marie Trotie, his wife of Batiscan to Joseph Guillet, Jean-Baptiste Guillet, Jean-Baptiste Guion dit Lachapelle, Guion, Etienne Bigué, his son-in-law, Duchesne, his son-in-law, Joseph Guion and Louis Guillet.

November 20, 1724 Trois Rivières
Normandin, D.:
Ratification by Louis Guillet-St. Marc and Marie Trottier, his wife of Batiscan.

September 21, 1726 Trois Rivières
Normandin, D.:
Marriage contract between Joseph Guillet dit St Marc (age 26) of Batiscan, the son of Louis Guillet-St Marc and of Marie Trottier of Batiscan and Angélique Lepellé (age 23) daughter of the late Claude Lepellé-Lahaye, captain of the Militia and of Marie-Charlotte Jeremie of Batiscant.

February 8, 1728 Trois Rivières
Trottain dit Saint-Seurin, F.:
Marriage contract between Jean-Baptiste Guillet (age 23), son of Louis Guillet dit St Mard and Marie Trotié of the Batiscan river and Marguerite Roy (age 22) daughter of the late Edmond Roy of Chateleros and Marie-Anne Janvié of  Ste Anne.

March 6, 1730 Batiscan
Church register of St-Francois-Xavier
Burial of Louis Guillet at the age of 73.  Witnesses: Nicolas Duclos and Francois Debroyeux.

August 12, 1730 Trois Rivières
Pollet, A.-B:
Division of inheritance between Marie Trotier, widow of Louis Guillet dit St. Marc of Batiscan, Joseph St. Marc, Jean-Baptiste Guillet of Batiscan, Etienne Bigué and Angélique St. Marc, his wife of Ste Marie, Jean-Baptiste Guion and Marie-Jeanne St. Marc, his wife of Ste Anne and Jean-Baptiste Adam and Catherine St. Marc, his wife, his children and in-laws.

May 12, 1739 Trois Rivières
Pollet, A.-B:
The last will and testament of Marie Trotier, widow of Louis Guillet, resident of the Batiscan river.