Why do people call royalty 'Blue Bloods'...?

Question

Is this because David Icke is right and they are Reptilian Humanoids with Blue Bloods? When should I remove the Tin foil on me head?

Also, why is there a little alien sitting on my shoulder?

Answer 1

I think you should remove the tin foil from your head as soon as the little alien leaves your shoulder.  That tin foil is protecting you from the thought police that the alien is reporting to.  

AAAHHHHHHH!

Answer 2

Blue blood is an English expression recorded since 1834 for noble birth or descent; it is a translation of the Spanish phrase sangre azul, which described the Spanish royal family and other high nobility who claimed to be 'pure', free of Moorish or Jewish blood, being of Visigothic descent.

Answer 3

In the ancient agricultural societies of Europe the whole upper class had superficial veins that might be more visible and appear bluish by comparison to the rest of the pale-pinkish skin, as the skin itself was not tanned. In contrast with the working class of the time (mainly peasants), nobility and in general upper class people did not have to work outdoors, and mostly lived sheltered from the sun by dwellings and attire.

It was the Spaniards who gave the world the notion that an aristocrat's blood is not red but blue. The Spanish nobility started taking shape around the ninth century in classic military fashion, occupying land as warriors on horseback. They were to continue the process for more than five hundred years, clawing back sections of the peninsula from its Moorish occupiers, and a nobleman demonstrated his pedigree by holding up his sword arm to display the filigree of blue-blooded veins beneath his pale skin—proof that his birth had not been contaminated by the dark-skinned enemy.

Note: An alternative traditional explanation, argyria (a disease causing a blue-grey skin tone after digestion of silver), is considered less valid, as table silverware was not regularly used by much of the nobility.