Chandos Lake was originally called Mongosogan by the Mississauga Anishinabe, on whose traditional territory it lies.
The 1781 Treaty of Fort Niagara, also known as Niagara Purchase, was signed by Colonel Guy Johnson for The Crown and representatives of the Ojibwa and Mississaugas Nations concluded on May 9, 1781.
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The 1764 Treaty of Fort Niagara was signed by Sir William Johnson for The Crown and 24 Nations from the Six Nations, Seneca, Wyandot of Detroit, Menominee, Algonquin, Nipissing, Ojibwa, Mississaugas, and others who were part of the Seven Nations of Canada and the Western Lakes Confederacy.
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The Mississaugas accepted a payment of "300 suits of clothing as payment for a four-mile strip along the Niagara River from Lake Ontario to Lake Erie."
The authorities of the colony hoped by this means to attract the Indians in the region, probably the Mississaugas, to trade with the French and thus dissuade them from taking their furs to the English at Fort Oswego.