Gov. Simcoe with several other government officers, guided by a party of Six Nations warriors, conducted a wilderness tour on foot down and back up the length of the Thames River in 1793 and decided to assign additional place names to mirror those they knew along the Thames River in England. Middlesex County was the name assigned to the area around a town site reserved at the "lower forks" in the river, to be called London; Dorchester was the name for a town site at the "middle forks", and the area around the "upper forks" was to be Oxford - the same sequence of names as found along the Thames in England. When legislation was passed in Upper Canada in 1798 to implement these new divisions, Norwich and Dereham were separated from Norfolk County and added to the new Oxford County, which included also Burford, Blenheim, Blandford and Oxford townships - names drawn from Oxfordshire in England.