The term 'Kuzu' (国樔) is also written as '国主' or '国栖' which meant nonagricultural people who spread to various places of Japan before the Nara period and were regarded as a different race by Yamato Dynasty because of their particular culture.
「国樔」は「国主」「国栖」とも書き、奈良時代以前の日本各地に散在していた非農耕民で、その特異な習俗のため大和朝廷からは異種族扱いされていた人々である。