Prime Minister William Lyon Mackenzie King (second from the right) with guests at the opening of the 1927 Canadian National Exhibition.
This would have been in the second of his three terms as Prime Minister of Canada (1921-1926; 1926-1930 and 1935-1948).
Mr King (1874-1950) 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 a greater independence from Britain and a stronger international voice.
Under his leadership, Canada also implemented policies such as unemployment insurance in response to industrialization, economic distress and changing social realities.
View the Prime Minister's signature in the Opening Day book.