1826 – He was born at Quebec City on the 30th of December.
1850 – He articled in law with Jean-Thomas Taschereau, was called to the bar and practiced at Quebec with Pierre Joseph Olivier Chauveau.
1854 – He married Mathilde Perrault.
1879 – He was named deputy protonotary for the Quebec Superior Court in Quebec district. Casgrain was named Queen’s Counsel.
– He served several terms as president of the Literary and Historical Society of Quebec.
1917 – He died at Quebec on the 23rd of May.