The Rule of One was a self-affirming doctrine conceived by Darth Sidious to replace the Rule of Two, a long-standing Sith doctrine he considered to be outmoded, it having fulfilled its purpose by placing him in power. Although officially it resembled Darth Bane's Rule of Two in terms of apprentices and the punishment thereof regarding rule violation, the Rule of One was, in reality, completely different, as there was no chance of succession for his Sith apprentices.