This paper seeks to retrace the changes in the instrumentalization of the past by Quebec politicians in the context of the growing importance of the constitutional issue in the 1960s. Studying the parliamentary debates and the speeches of this decade makes it possible to identify the conflicts of representation that occur in three key moments of Quebec’s political culture. Hence, Maurice Duplessis’s legacy is eventually overshadowed by the question of the cohabitation between the two founding people of the Confederation on the eve of its 100th anniversary. This matter, at first consensual, then becomes a major point of contention between the actors in Quebec’s political field.