According to Daniel Boyarin, the underlying distinction between religion and ethnicity is foreign to Judaism itself, and is one form of the dualism between spirit and flesh that has its origin in Platonic philosophy and that permeated Hellenistic Judaism. Consequently, in his view, Judaism does not fit easily into conventional Western categories, such as religion, ethnicity, or culture. Boyarin suggests that this in part reflects the fact that much of Judaism's more than 3,000-year history predates the rise of Western culture and occurred outside the West (that is, Europe, particularly medieval and modern Europe). During this time, Jews experienced slavery, anarchic and theocratic self-government, conquest, occupation, and exile. In the Diaspora, they were in contact with, and influenced by, ancient Egyptian, Babylonian, Persian, and Hellenic cultures, as well as modern movements such as the Enlightenment (see Haskalah) and the rise of nationalism, which would bear fruit in the form of a Jewish state in their ancient homeland, the Land of Israel. They also saw an elite population convert to Judaism (the Khazars), only to disappear as the centers of power in the lands once occupied by that elite fell to the people of Rus and then the Mongols. Thus, Boyarin has argued that "Jewishness disrupts the very categories of identity, because it is not national, not genealogical, not religious, but all of these, in dialectical tension."