It is common that the first child or a younger brother of the monarch first becomes a crown prince (dauphin) or kotaitei (an emperor's younger brother considered heir apparent), then succeeds to the throne after the death of the predecessor.
君主の第一子や弟が皇太子（王太子）や皇太弟（王太弟）に就任し、先代君主が亡くなった後に継ぐことが多い。