| Dukedom of Saint Andrews and Castelblanco | |
|---|---|
 | |
| Creation date | 4 February 1717 |
| Creation | One |
| Created by | "James III and VIII" |
| Peerage | Jacobite peerage |
| First holder | José De Rozas "1st Duke of Saint Andrews and Castelblanco" (16 December 1665 – July 1722) |
| Present holder | Extinct or Dormant since 1722 |
| Remainder to | 1st Duke's heirs and assigns whatsoever of the act, lawfully and legal. |
| Subsidiary titles | Marquess Borland Earl of Fordan Viscount of The Bass Lord Divron |
| Status | Exctinct or Dormant |
| Extinction date | ¿1717? |
The Dukedom of Saint Andrews and Castelblanco commonly know as Dukedom of Whitecastle was created on 4 February 1717 for José de Rozas (16 December 1665 – July 1722) was a Spanish nobleman and colonial official who became a leading figure in Jacobite politics in Europe created twice in the Peerage of England, in the Jacobite peerage.