Blenheim, Black and Tan, Ruby and Tri-Colour
The most common clour, the Blenheim, is named in honour of Blenheim Palace. This is where John Churchill, 1st Duke of Marlborough, raised this particular colour, the predecessors to the Cavalier breed.
The Blenheim spot is also known as the mark of the "Duchess Thumb Print", based on the legend that Sarah Churchill, Duchess of Marlborough while awaiting news of her husband's safe return from the Battle of Blenheim, pressed the head of an expecting dam with her thumb, resulting in five puppies bearing the lucky mark after news that the battle had been won.
Rich chestnut markings well broken up on pearly white. The chestnut on the head must extend around the eyes as well as down over the ears. There should be a blaze of white between the eyes and ears in the centre of which may be a lozenge or 'blenheim spot' unique to the Blenheim Cavalier, highly desireable, but not essential.
"Cavalier King Charles Spaniels (2821585840)" by David Shankbone from USA - Cavalier King Charles SpanielsUploaded by maybeMaybeMaybe. Licensed under Creative Commons Attribution 2.0 via Wikimedia Commons
Black and white well spaced, broken up, with tan markings over eyes, cheeks, inside ears, inside legs and on underside of tail.
Black and Tan
Raven black with tan markings above the eyes, on cheeks, inside ears, on chest and legs and underside of tail. Tan should be bright. White marks undesirable.
Whole coloured rich red. White markings undesirable.