This book traces the intellectual origins of race theory in the pro-Nazi Ustasha Independent State of Croatia, 1941-1945. This race theory was not, as historians of the Ustasha state have hitherto argued, a product of a practical accommodation to the dominant Nazi racial ideology. Contrary to the general historiographical view, which has either downplayed or ignored the important place of race, not only in Ustasha ideology and politics, but more generally in modern Croatian and Yugoslav nationalism, this work stresses the significant role that theories of ethnolinguistic origin and racial anthropology played in defining Croat nationhood from the mid-nineteenth to the mid-twentieth century. Upon the basis of older ideological and cultural traditions, the Ustasha state constructed an ideal Aryan racial type.