| Entry Type | Person |
| Surname | Cavendish |
| Forenames | William John Robert |
| Also Known As | Cavendish, Billy |
| Title | Marquess of Hartington |
| Epithet | Heir to Chatsworth estate; killed in World War Two. Married Kathleen Kennedy, daughter of Joseph Kennedy and sister of John F Kennedy. Known as Billy. |
| Dates | 1917-1944 |
| Authorised Form of Name | Cavendish; William John Robert (1917-1944); Marquess of Hartington; Heir to Chatsworth estate; killed in World War Two. Married Kathleen Kennedy, daughter of Joseph Kennedy and sister of John F Kennedy. Known as Billy. |
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