King Charles Spaniel was so named because the
Blenheim was the children's pet in the household of King Charles the
First. In the beginning of the 1900's, an American offered twenty-five
pounds as a prize to any King Charles Spaniel 'of the old-fashioned
type' with a longer nose, flat skull and a spot in the middle of the
forehead, commonly called 'the kiss of Buddha'. So, the breed was
developed by selective breeding of short-snouted King Charles Spaniels
(also known as English Toy Spaniels).