Daughters of a Duke
A daughter of a duke has the style of 'Lady' before her forename and surname, eg the elder daughter of the Duke of Norfolk is Lady Rachel Fitzalan Howard.
On marriage she continues to use the same style, with her husband's surname, ie when Lady Rose FitzRoy married Mr Guy Monson, she became Lady Rose Monson.
Should she marry a peer she adopts his title.
How to address the Daughters of a Duke
The recommended (social) style of address is as follows:
| Beginning of letter | Dear Lady Rose |
| End of letter | Yours sincerely |
| Envelope | Lady Rose Monson |
| Joint form of address | Mr Guy and Lady Rose Monson |
| Verbal communication | Lady Rose (on introduction, Lady Rose Monson) |
| Invitation | Lady Rose Monson |
| Invitation* to husband & wife | Mr Guy and Lady Rose Monson |
| Description in conversation | Lady Rose |
| List of Directors or Patrons | Lady Rose Monson |
| Place card | Lady Rose Monson |
| Legal document | Olivia Rose Mildred Monson commonly called Lady Rose Monson |
*Note that, traditionally, invitations to a married couple, when sent to their home address, are addressed to the wife alone, with both names being inscribed on the invitation card. It has become increasingly acceptable, however, to address the envelope with both names.
Exceptions
If she marries a courtesy peer, and the precedence she derives from this is lower than that she derives from her father, she has the option of:
(a) adopting the usual style of the wife of a courtesy peer, eg Countess of Twickenham, or
(b) continuing her own style followed by the courtesy title, eg Lady Mary Twickenham.
In practice very few ladies now adopt course (b) unless the marriage has been dissolved.
If the daughter of a duke marries the younger son of a duke or marquess, again she has the option of:
(a) adopting the usual style of the wife of a younger son of a duke or marquess, eg Lady Charles Manners, or
(b) continuing her own style followed by her surname, eg Lady Mary Manners
