Louis Lacoste was a Quebec

Quebec

Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

 notary

Civil law notary

Civil-law notaries, or Latin notaries, are lawyers of noncontentious private civil law who draft, take, and record legal instruments for private parties, provide legal advice and give attendance in person, and are vested as public officers with the authentication power of the State...

 and political figure. He was a Conservative

Conservative Party of Canada (historical)

The Conservative Party of Canada has gone by a variety of names over the years since Canadian Confederation. Initially known as the "Liberal-Conservative Party", it dropped "Liberal" from its name in 1873, although many of its candidates continued to use this name.As a result of World War I and the...

 member of the Senate of Canada from 1867 to 1878.

He was born in Boucherville

Boucherville, Quebec

Boucherville is a city in the Montérégie region in Quebec, Canada. It is a suburb of Montreal on the South shore of the Saint Lawrence River....

 in 1798. He studied law and became a notary, practicing in Boucherville. In 1834, he was elected to represent the county of Chambly in the Legislative Assembly of Lower Canada

Legislative Assembly of Lower Canada

The Legislative Assembly of Lower Canada was the lower house of the bicameral structure of provincial government in Lower Canada until 1838. The legislative assembly was created by the Constitutional Act of 1791...

, serving until 1838. He supported Louis-Joseph Papineau

Louis-Joseph Papineau

Louis-Joseph Papineau , born in Montreal, Quebec, was a politician, lawyer, and the landlord of the seigneurie de la Petite-Nation. He was the leader of the reformist Patriote movement before the Lower Canada Rebellion of 1837–1838. His father was Joseph Papineau, also a famous politician in Quebec...

 and was arrested in December 1837; he was released in July 1838. He was elected to the Legislative Assembly of the Province of Canada

Legislative Assembly of the Province of Canada

The Legislative Assembly of the Province of Canada was the lower house of the legislature for the Province of Canada, which consisted of the former provinces of Lower Canada, then known as Canada East and later the province of Quebec, and Upper Canada, then known as Canada West and later the...

 for Chambly in an 1843 by-election; he was reelected in 1844. He did not run in 1848 but was elected again in an 1849 by-election and reelected in 1851. He was elected again in 1858 and resigned in 1861 to run for a seat in the Legislative Council

Legislative Council of the Province of Canada

The Legislative Council of the Province of Canada was the upper house for the Province of Canada, which consisted of the former provinces of Lower Canada, then known as Canada East and later the province of Quebec, and Upper Canada, then known as Canada West and later the province of Ontario...

 for Montarville division in 1861. He served until Confederation

Canadian Confederation

Canadian Confederation was the process by which the federal Dominion of Canada was formed on July 1, 1867. On that day, three British colonies were formed into four Canadian provinces...

, when he was named to the Senate.

He died in Boucherville in 1878 while still in office.

He was the father of Alexandre Lacoste

Alexandre Lacoste

Sir Alexandre Lacoste, PC was a Canadian lawyer, professor, and politician.He was born in Boucherville, Quebec in 1842, the son of Louis Lacoste. From 1880 to 1923, he was a professor of law at the Université de Montréal.In 1882, he was appointed to the Legislative Council of Quebec...

, who also became a member of the Senate.