Marquis Xi of Cai

Marquis Xi of Cai (蔡釐侯) (died 761 BC), given name Suǒshi (所事), was the eighth ruler of the State of Cai from 809 BC to 761 BC. He was the only known son of Marquis Yi of Cai (蔡夷侯), his predecessor. His reign lasted for 48 years, the longest reign in Cai history. He was succeeded by his son.