There is a great debate in the field of history about whether Duke Zhou is king. But tradition holds that he is not an official king. Only the Regent. At the beginning, cutting Zhou, died three or four years later. King Wu's son became king at a young age (the exact age is also controversial, but it should be underage), so Duke Zhou presided over the state affairs as regent, which was misunderstood by many people as usurping the throne. This led to riots. Duke Zhou suppressed the riot with the understanding and support of Zhao Gong and Jiang Taigong. When the king came of age, the Duke of Zhou returned power to the king.
Because Duke Zhou is a legendary ritual and arranged the Book of Changes in Zhou Wenwang, he is also a myth. Some people say he can interpret dreams. But there is a legend about Zhuang Zhou. There is no conclusion now.