| Mu of Cai | |
|---|---|
| Reign: | 675–646 BC |
| Parent{s}: | Marquess Ai of Cai (蔡哀侯) Marchessa of Cai (蔡侯妃) |
| Spouse(s): | Unknown |
| Issue(s): | Jī Jiǎwǔ |
| Ancestral name (姓): | Ji (姬) |
| Given name (名): | Xī (肸) |
| Courtesy name (字): | Unknown |
| Posthumous name (謚): | Mu (穆) |
| Styled: | Mu, the Marquis of Cai (蔡穆侯) |
| General note: Dates given here are in the Julian calendar. They are not in the proleptic Gregorian calendar. | |
| ——— | |
Marquis Mu of Cai (蔡穆侯) (?–646 BC), born Jī Xī (姫肸), was the fourteenth ruler of the State of Cai from 675 BC to 646 BC. He was the only known son of Marquess Ai of Cai (蔡哀侯), his predecessor. His reign was a period of 29 years. He was succeeded by his son.