| Marquis Xi of Cai | |
|---|---|
| Reign: | 809–761 BC |
| Parent{s}: | Marquess Yì of Cai (蔡夷侯) |
| Spouse(s): | Unknown |
| Issue(s): | Ji Xing |
| Ancestral name (姓): | Ji (姬) |
| Given name (名): | Suǒshi (所事) |
| Posthumous name (謚): | Xi (釐) |
| General note: Dates given here are in the Julian calendar. They are not in the proleptic Gregorian calendar. | |
| ——— | |
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.