When counties were established in New York in 1683, the present Cortland County was part of Albany County, which encompassed the northern part of New York and all of the present State of Vermont, as well as indeterminate territory to west. On March 12, 1772, present day Cortland County became part of Tryon County, named for William Tryon, colonial governor of New York. In 1784, following the peace treaty that ended the American Revolutionary War, the name of the county was changed to honor General Richard Montgomery, who had captured several places in Canada and died attempting to capture the city of Quebec, thus replacing the name of the locally unpopular British governor. Present day Cortland County became part of Herkimer County in 1791, then became a part of Onondaga County when it split from Herkimer in 1794. Cortland County was formed by the splitting of Onondaga County in 1808.