So many people comment about the spot on the top of my head...well here's the story.
According to several authors of Cavalier books, the Duchess of Marlborough held a pregnant spaniel on her lap and repeatedly pressed her thumb on the bitch's head while worrying about her husband the Duke as he was away fighting in the battle of Blenheim. When the news arrived to her that her husband survived the battle, the bitch whelped her puppies and they all had the thumb print on the top of their heads, now known as the blenheim spot. Not all Cavaliers have the spot, however it is considered a desired marking.
As for ME, I proudly show my blenheim spot for all to see. Go ahead give a rub, it's very soft. But watch out when you least expect it I will give you a kiss.