The Duke of Zhou (Chinese: 周公旦, pinyin: Zhōu Gōng Dàn) was the brother of King Wu of Zhou. Only three years after defeating the Shang Dynasty King Wu died, leaving the task of consolidating the dynasty's power to the Duke of Zhou, who ruled as regent. The Duke of Zhou fought with the rulers of eastern states who joined with the remnants of the Shang to oppose the Zhou. The east was conquered in five years.

According to Chinese legend, he annotated the hexagrams and completed the classic of I Ching, established the Classic of Rites and created the Classic of Music .