Joseph Philippe Pierre Yves Elliott Trudeau PC CC CH QC FRSC (October 18, 1919 – September 28, 2000), often referred to by the initials PET, was a Canadian statesman who served as the 15th Prime Minister of Canada (1968–1979 and 1980–1984). He is the third longest-serving Prime Minister in Canadian history (behind William Lyon Mackenzie King and John A. Macdonald), having served for 15 years, 164 days.