This term for nobility comes from the Spanish sangre azul
n royal or aristocratic ... [
Translation of Spanish sangre azul : sangre, blood + azul, blue (probably from 
the... [DOC] [TLE] The modern aristocracy | All about nobility titles [PAR] Aristocracy Runs Deep When It Comes to Bloodlines ... phrase was first recorded 
in 1834, the term was originally derived from the Spanish saying sangre azul.