* King Charles Spaniel: This breed, with its flat face, was a popular companion in the 16th and 17th centuries. They were often depicted in paintings alongside royalty.
* Blenheim Spaniel: This breed, with its distinctive chestnut and white coat, was also a popular companion dog.
* Other Small Spaniels: It's likely that smaller spaniels of the time, such as the "Toy Spaniel," were also used in the development of the breed.
While the exact origins are still debated among breeders, the Cavalier King Charles Spaniel is recognized for its gentle, affectionate nature, which is likely a result of its lineage of beloved companion dogs.