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Lester Bowles (“Mike”) Pearson, PC, OM, CC, OBE, prime minister 1963–68, statesman, politician, public servant, professor (born 23 April 1897 in Newtonbrook, ON; died 27 December 1972 in Ottawa, ON). Lester Pearson was Canada’s foremost diplomat of the 1950s and 1960s. He formulated the basics of the country’s postwar foreign policy; particularly its involvement in NATO and the United Nations, where he served as president of the General Assembly. In 1957, he received the Nobel Peace Prize for his diplomatic efforts in facilitating Britain and France’s departure from Egypt during the Suez Crisis. A skilled politician, he rebuilt the Liberal Party and as prime minister strove to maintain Canada’s national unity. Under his leadership, the government implemented a Canada Pension Plan; a universal medicare system; a unified Armed Forces; and a new national flag.

The prime minister (PM) is the head of the federal government. It is the most powerful position in Canadian politics. Prime ministers are not specifically elected to the position; instead, the PM is typically the leader of the party that has the most seats in the House of Commons. The prime minister controls the governing party and speaks for it; names senators and senior judges for appointment; and appoints and dismisses all members of Cabinet. As chair of Cabinet, the PM controls its agenda and greatly influences the activities and priorities of Parliament. In recent years, a debate has emerged about the growing power of prime ministers, and whether this threatens other democratic institutions.

William Lyon Mackenzie King, prime minister of Canada 1921–26, 1926–30 and 1935–48 (born 17 December 1874 in Berlin [Kitchener], ON; died 22 July 1950 in Kingsmere, QC). William Lyon Mackenzie King was the dominant political figure in an era of major changes. He was leader of the Liberal Party from 1919 to 1948, and Prime Minister of Canada for almost 22 of those years. King was Canada’s longest-serving prime minister. He steered Canada through industrialization, much of the Great Depression, and the Second World War. By the time he left office, Canada had achieved greater independence from Britain and a stronger international voice. It had also implemented policies such as employment insurance.

The King-Byng Affair was a constitutional crisis that happened in 1926. It pitted the powers of a prime minister against the powers of a governor general. It began when Prime Minister William Lyon Mackenzie King asked Governor General Lord Julian Byng to dissolve Parliament and call a new election. Byng refused. It ended with King winning another election. Since then, no governor general has publicly refused the advice of a prime minister.

This article is a plain-language summary of the King-Byng Affair. If you are interested in reading about this topic in more depth, please see our full-length entry: King-Byng Affair.