Joseph Arthur de Gobineau was a French aristocrat and anthropologist, who is best known for helping to legitimise racism by the use of scientific race theory and "racial demography", and for developing the theory of the Aryan master race and Nordicism. Known to his contemporaries as a novelist, diplomat and travel writer, he was an elitist who, in the immediate aftermath of the Revolutions of 1848, wrote An Essay on the Inequality of the Human Races. In it he argued that aristocrats were superior to commoners and that aristocrats possessed more Aryan genetic traits because of less interbreeding with inferior races.

Scientific racism, sometimes termed biological racism, is the pseudoscientific belief that the human species can be subdivided into biologically distinct taxa called "races", and that empirical evidence exists to support or justify racism, racial inferiority, or racial superiority. Before the mid-20th century, scientific racism was accepted throughout the scientific community, but it is no longer considered scientific. The division of humankind into biologically separate groups, along with the assignment of particular physical and mental characteristics to these groups through constructing and applying corresponding explanatory models, is referred to as racialism, race realism, or race science by those who support these ideas. Modern scientific consensus rejects this view as being irreconcilable with modern genetic research.