King Wu Attacks King Zhou
Shang was an ancient tribe along the lower reaches of Yellow River. It is believed that Shang's ancestry can be traced back to Qi, whose mother gave birth to him after swallowing an egg of a swallow. Shang's tribe in its early period often moved about: its capital had been changed five times during its reign of 300 years. After Emperor Pangeng chose Yin ( in the northeast part of today's Anyang, Henan province ) as its capital, Shang Dynasty experienced a period of prosperity. During Wuding's 50 years rule, Shang Dynasty reached its heyday.