The Taika Reforms were a gekokujo (an inverted social order when the lowly reigned over the elite) coup in which the ruling family of Kinai region killed the emperor of Kyushu dynasty and deprived him of the throne.
畿内大和の豪族が九州王朝の天皇を殺害し皇権を簒奪した、下克上のクーデターである。