Not to be confused with
William Lyon Mackenzie, Mackenzie King's grandfather. William Lyon Mackenzie King,
PC,
OM,
CMG (
December 17,
1874 –
July 22,
1950) was the tenth
Prime Minister of
Canada from
December 29,
1921, to
June 28,
1926;
September 25,
1926, to
August 6,
1930; and
October 23,
1935, to
November 15,
1948. With over 21 years in the office, he was the longest serving Prime Minister in
British Commonwealth history. He is commonly known either by his full name or as Mackenzie King. Mackenzie was one of his given names, not part of his surname, but he was never publicly referred to as simply "William King." Friends and family called him by his nickname, "Rex."
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