Paleo-Indian groups followed retreating glaciers into the area 11,000 years ago. Woodland Indians inhabited the area circa 1000 BC-1000 AD, followed by Iroquoians and Mississaugas circa 1740.
In 1615, Samuel de Champlain traveled through the area and stayed for a brief period of time near the present-day site of Bridgenorth, just north of Peterborough.
In 1818, Adam Scott settled on the west shore of the Otonobee River. The following year he began construction of a sawmill and gristmill, establishing the area as Scott's Plains.
1825 marked the arrival of 2,000 Irish immigrants from the city of Cork. In 1822, the British Parliament had approved an experimental emigration plan to transport poor Irish families to Upper Canada. The scheme was managed by Peter Robinson, at the time a politician in York (present-day Toronto). Scott's Plains was re-named Peterborough in his honor.
In 1845, Sandford Fleming, inventor of Standard Time and designer of Canada's first postage stamp, moved to the city to live with Dr. John Hutchison and his family, staying until 1847. Dr. John Hutchison was one of Peterborough's first resident doctors.
Peterborough was incorporated as a town in 1850 (population 2,191).
Beginning in the late 1850's, a substantial canoe building industry grew up in and around Peterborough. The Peterborough Canoe Company was founded in 1893, with the factory being built on the site of the original Adam Scott mill. By 1930, 25% of all employees in the boat building industry in Canada worked in the Peterborough area. The period from 1928-36 saw the establishment of the Johnson Motor Company/Outboard Marine as an outgrowth of the original industry. Canoe building remained significant here until the early 1960's. Reflecting this heritage the city is now home to the Canadian Canoe Museum.
Peterborough would also see extensive industrial growth as the city was one of the first places in the country to begin generating hydro electrical power (even before Niagara). Companies like Edison General Electric Company (later Canadian General Electric) and America Cereal Company (later to become Quaker Oats), opened to take advantage of this new cheap resource.
Peterborough was incorporated as a city in 1905 (population 14,300).
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