Did you know…?
…that ‘blue blood’ started flowing in English since the early 1800s. It comes from an older Spanish saying.
Old, aristocratic Spanish families used to boast that their skin was fairly light because they had not intermarried with the darker-skinned Moors. The Spaniards’ veins showed through their skin as visibly blue in colour. If their skin was darker because they had intermarried, the blood would not appear so blue.
Today anybody can be called a blue blood if he or she is of noble birth, a member of high society, and so on.