In the formative period of the Yamato Dynasty, clans called 'uji' appeared from consanguineous groups called 'kabane,' and such professional groups called 'uji' or 'be' took charge of duties according to their power and ability.
ヤマト王権の形成期、「カバネ（カバネ）」と呼ばれる血縁集団から「氏（ウジ）」と呼ばれる同族集団が現れ、この「氏」や「部（ベ）」と呼ばれる職能集団が、それぞれの勢力や能力によって王権内の仕事を分掌した。