Originally it was awarded to the winner of the OHA's junior playoffs. In 1933–34 it was re-designated for annual presentation to the association's Junior A champion. The first Junior A winners were the Toronto St. Michael's Majors. When the top junior level in Ontario was again separated into two categories in 1970–71, the Robertson Cup remained with the higher tier as its championship trophy. This has remained constant through the series changing its name to the Ontario Major Junior Hockey League in 1974 and to the Ontario Hockey League in 1980.