Concise AACR2rule 35C

35C.

If a person acquires a title of nobility, gives up such a title, or acquires a new title of nobility, follow the instructions in rule 32B in choosing the name to be used as the basis for the heading.
2. Disregard reference sources that list members of the nobility either all under title or all under surname.
3. The terms of rank in the United Kingdom peerage are Duke, Duchess, Marquess (Marquis), Marchioness, Earl, Countess, Viscount, Viscountess, Baron, and Baroness.

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