Career
He represented Verchères in the Legislative Assembly of Quebec from 1879 to 1881 as a Liberal. He was born Achille Chagnon in Verchères, Lower Canada, the son of Hubert Chagnon and Marguerite Chagnon, and was educated at the Collège de l"Assomption. In 1872, he moved to Ware, Massachusetts.
He was elected to the Quebec assembly in an 1879 by-election held after the election of Jean-Baptiste Brousseau was overturned.
Larose died at Calixa-Lavallée at the age of 64.