The Cavalier King Charles Spaniel descends from the small toy spaniels that were fixtures of European courts as early as the sixteenth century. These early spaniels were prized not for hunting prowess but for warmth and companionship, frequently depicted curled in the laps of nobility. Paintings by Titian, Van Dyck, and Gainsborough show small spaniels with longer muzzles and flatter skulls than the modern King Charles Spaniel, providing a visual record of the breed's original form.
During the seventeenth century, King Charles II of England became so devoted to these spaniels that the breed was forever linked to his name. Court diarist Samuel Pepys noted the king's habit of playing with his dogs during council meetings, and a popular legend holds that Charles II issued a royal decree granting the spaniels access to any public building in the kingdom. Whether or not the decree was genuine, the association cemented the breed's identity as a dog of royal privilege.
By the Victorian era, breeders had crossed the original toy spaniels with flatter-faced breeds such as the Pug and Japanese Chin, producing the rounder-skulled King Charles Spaniel recognized today. The longer-muzzled type nearly vanished until the 1920s, when American financier Roswell Eldridge offered prize money at Crufts for spaniels resembling those in old royal portraits. Breeders responded, and the modern Cavalier King Charles Spaniel was deliberately reconstructed to recapture the original appearance.
The breed was formally recognized as a distinct entity from the King Charles Spaniel by The Kennel Club in 1945. Its development from that point was steady, shaped by a small but dedicated community of breeders committed to preserving the gentle temperament and moderate structure that defined the historical type.