Question: Which title was created for the illegitimate daughter of the king of Jacobite peerage in 1784 when he legitimized her ?

text: Jacobite peerage
Dukes

The Jacobite peerage includes those peerages created by James II and VII, and the subsequent Jacobite pretenders, after Jamess deposition from the thrones of England, Scotland and Ireland following the Glorious Revolution of 1688. These creations were not recognised in English, Scots or Irish law, but the titles were used in Jacobite circles in Continental Europe and recognised by France, Spain and the Papacy. Jacobite peerages ceased to be created after 1760 except for a title created by the Young Pretender, Prince Charles Edward Stuart, for his illegitimate daughter in or before 1783. The following tables list the peerages and baronetcies created by the Stuart claimants in exile.
Title Date of creation Surname Current status Peerage Notes
Duke of Powis 12 January 1689 Herbert extinct 8 March 1748 England for William Herbert , 1st Marquess of Powis
Duke of Albemarle 13 January 1696 FitzJames extinct 27 December 1702 England for Henry FitzJames , an illegitimate son of King James II and VII . He also bore the title of Grand Prior of England
Duke of Northumberland 22 December 1716 Wharton extinct 31 May 1731 England for Philip Wharton , 6th Baron Wharton ( 2nd Marquess of Wharton )
Duke of Albemarle 3 November 1721 Granville extinct 2 July 1776 England for George Granville ( 1st Baron Lansdowne )
Duke of Arran 2 January 1722 Butler extinct 17 December 1758 England for Charles Butler ( 1st Earl of Arran ) , also 3rd Duke of Ormonde from 16 November 1745
Duke of Strafford 5 January 1722 Wentworth extinct 10 March 1791 England for Thomas Wentworth . 3rd Baron Raby ( 1st Earl of Strafford )
Duke of York shortly after 6 March 1725 Stuart merged in the crown 31 January 1788 England for Henry , younger son of James Francis Edward Stuart
Duke of Melfort 17 April 1692 Drummond extinct or dormant since 28 February 1902 Scotland for John Drummond , 1st Earl of Melfort , holder also Duke of Perth from 2 July 1800 until extinction
Duke of Perth before 17 October 1701 Drummond extant Scotland for James Drummond , 4th Earl of Perth , also Duke of Melfort from 2 July 1800 to 28 February 1902
Duke of Mar 22 October 1715 Erskine extant Scotland for John Erskine , Earl of Mar
Duke of Rannoch 1 February 1717 Murray extant Scotland for William , Earl of Tullibardine ( Marquess of Tullibardine , and after 9 July 1724 2nd Duke of Atholl , by which title he was known among Jacobites , and even by James Francis Edward Stuart )
Duke of St Andrews and Castelblanco 4 February 1717 de Rozas dormant Scotland for José de Rozas , Conde de Castelblanco , son-in-law of the 1st Duke of Melfort
Duke of Inverness 4 April 1727 Hay extinct 1740 Scotland for John Hay of Cromlix , 1st Earl of Inverness
Duke of Fraser 14 March 1740 Fraser extinct 8 December 1815 Scotland for Simon Fraser , 11th Lord Lovat
Duchess of Albany 24 March 1783 or before Stuart extinct 14 November 1789 Scotland for Charlotte Stuart , illegitimate daughter of Charles Edward Stuart by Clementina Walkinshaw
Duke of Tyrconnell 30 March 1689 Talbot extinct 14 August 1691 Ireland for Richard Talbot , 1st Earl of Tyrconnell
Duke of Mar 13 December 1722 Erskine extinct 16 March 1766 Ireland also Duke of Mar in Scotland