The Ontario Historical Society
The foremost historical organization in the province, the Ontario Historical Society, originally called the Pioneer Association of Ontario, was established on September 4, 1888 largely through the efforts of the Reverend Henry Scadding. It initially operated as a federation of local groups and was primarily concerned with the promotion of British-Canadian nationalism through the study of history. Reorganized in 1898 and incorporated with an expanded mandate the following year, the Society became increasingly involved in the movement to preserve archival records and historic sites. It also assumed more scholarly pursuits, including a publication program, in addition to encouraging and co-ordinating the activities of local historical associations and museums. Today the Society continues its many efforts to preserve, interpret and publicize Ontario's multi-faceted heritage.
Plaque via Alan L. Brown's site Toronto Plaques. Full page here.