Whiteness emerged gradually through specific historical developments rather than existing as a timeless concept. Evidence shows that ancient Romans and Greeks did not have our modern concept of race, instead viewing human differences through environmental and cultural lenses. Archaeological findings reveal that darker-skinned people lived throughout medieval Britain without systematic discrimination based on skin color. Several key historical developments contributed to later white supremacy: the Crusades’ creation of a European Christian identity, Spanish and Portuguese maritime expansion, early slave trading, and English colonization of Ireland. The latter served as a testing ground for colonial practices that were later applied globally. While pre-modern societies exhibited xenophobia and religious discrimination, these differed fundamentally from modern racial concepts, were not based on immutable biological characteristics, and could change through conversion or environmental adaptation. White supremacy emerged from these and other intersecting historical strands rather than having any single cause, challenging reductionist historical explanations.