Origin of the Phrase “Blue Blood”

The term “blue blood” originates from Spanish nobility in the Middle Ages. Nobles claimed to have “sangre azul” (Spanish for “blue blood”) because their veins appeared bluish under their pale skin. Unlike the working class, who often had suntanned, darker skin from outdoor labor, the aristocrats rarely went outside and maintained fair, pale complexions. This visible distinction gave rise to the idea that “blue blood” indicated noble lineage or “pure” bloodline.

How “Blue Blood” Evolved in English

The concept of “blue blood” as a marker of high social rank or nobility was eventually adopted by English speakers. By the 19th century, “blue blood” was commonly used in English to describe aristocrats or members of high society.

Fun Fact: The Science Behind the Blue Veins

Interestingly, veins aren’t actually blue! The blue appearance is an effect of how light penetrates the skin and scatters, making the veins appear blue to the human eye. However, the symbolism of “blue blood” remains a colorful way to reference nobility and heritage.

Usage of “Blue Blood” Today

Nowadays, “blue blood” is often used figuratively to describe people from old, established, or wealthy families, especially those with a long history of prestige or influence.