Page "Wu (state)" Paragraph 1

According to the Records of the Grand Historian, the rulers of Wu are descended from Taibo, the elder uncle of King Wen of Zhou.

Realising that his younger brother, Jili, was wiser than him, and deserved to inherit the throne, Taibo fled to Wu and settled there.

Three generations later, King Wu of Zhou defeated the last Shang Dynasty emperor, and enfeoffed the descendents of Taibo in Wu.