Local branches and many under the patronage of lieutenant governors, complement these areas of focus by acting as a grassroots rallying point for members.

[3] It was established after Aimers attended a 1969 tour of Canada by Lieutenant Colonel JC du Parc Braham, chancellor of the London-based International Monarchist League.

[6] The newly formed MLC inherited a list of 50 Canadian members of the British-based league and held its first public meeting several months later at Ottawa, in June 1970.

[6] In the 1960s and 1970s, there was a growing mood of Canadian and Québécois nationalism and criticism from opponents of monarchy who perceived the institution as an archaic and foreign symbol of colonialism and the British Empire.

[citation needed] Through the same decade, the league was heavily involved in opposition against constitutional amendment proposals that would have created the governor general as head of state above the monarch.

[citation needed] The league commissions a study on the actual cost of the Canadian monarchy every three years, the most recent of which was completed in 2021.

Often, members are called upon to engage in debate on television and radio shows, or offer commentary on occasions of royal significance.

There are currently over 20 branches/contact groups across the country:[citation needed] The League maintains an active youth wing called the Young Monarchists.