The county was ceded to Sweden by
Russia together with
Ingria by the
Treaty of Stolbovo in 1617. The county extended to the parishes of
Lieksa in the north and of
Suojärvi in the east. In the south and west, the county was bordered by
Viborg and Nyslott County. Following the
Great Northern War, southern and eastern parts were ceded to Russia in 1721, and the territory that remained was reconstituted into the
County of Kymmenegård and Nyslott (, ), with the remainder of the
Viborg and Nyslott County. In 1743 following a
new conflict part of this county was also ceded to Russia in the
Treaty of Åbo. The ceded parts of the
County of Viborg and Nyslott and the County of Kexholm were at first part of the
Saint Petersburg Governorate, but in 1744 they were reconstituted with new conquests into the Russian
Vyborg Governorate, which also became known as
Old Finland. Remainder of the
County of Kymmenegård and Nyslott was joined with some parts of the
County of Nyland and Tavastehus in 1747 into the
County of Savolax and Kymmenegård. After the Russian victory in the
Finnish War of 1809,
Sweden ceded all its territory in Finland to Russia by the
Treaty of Fredrikshamn. As part of the
Russian Empire Finland came to constitute a separate grand duchy. In 1812 Russia made the territories of the
Vyborg Governorate part of the new
Grand Duchy of Finland as
Viipuri Province. ==Maps==