Noah about to be baptised. In medieval Christianity, Noah's three sons were generally considered as the founders of the populations of the three known continents, Japheth/Europe, Shem/Asia, and Ham/Africa, although a rarer variation held that they represented the three classes of medieval society – the priests (Shem), the warriors (Japheth), and the peasants (Ham). In medieval Christian thought, Ham was considered to be the ancestor of the people of black Africa. So, in racialist arguments, the curse of Ham became a justification for the slavery of the black races. Isaac Newton, in his religious works on the development of religion, wrote
Curse of Ham likely to receive a far greater reward in the next world than would the Japhetic nobility. The idea that serfs were the descendants of Ham soon became widely promoted in Europe. An example is Dame Juliana Berners (c. 1388), who, in a treatise on hawks, claimed that the "churlish" descendants of Ham had settled in Europe, those of the temperate Shem in Africa, and those of the noble Japheth in Asia (a departure from normal arrangements, which placed Shem in Asia, Japheth in Europe, and Ham in Africa), because she considered Europe to be the "country of churls", Asia of