Thank you Artemisia. So Freidrich was not the last "heir" - I didn't know that.
Also, as one of the suspended titles includes Earl of Clarence, I think it even less likely that the title Duke of Clarence will be used, apart from its negative history.
Could they create a new Dukedom? Is it likely? How likely is it to restore a title such as Duke of Suffolk (not specifically a royal title)
You are most welcome, cepe.
The titles Duke and Earl of Clarence are separate and not tied with each other. There has only been one creation of the title Earl of Clarence; it was originally created as a subsidiary title for Prince Leopold, Duke of Albany in 1881 and was inherited by his son, Prince Charles Edward. As with other titles of the latter, it is currently in suspension.
The title Duke of Clarence has been created three times - all in the peerage of England. The third and last creation of the title was in 1461 for George Plantagenet, the third son of Prince Richard, 3rd Duke of York, and brother to Edward IV and Richard III. After The Duke of Clarence was executed for treason in 1478, all his titles and styles were forfeit (in any case, his only son and heir died without issue in 1499).
The title of the Duke of Clarence was basically forgotten until late 18th century, when it was first used as part of two territorial Dukedom. Prince William, the third son of George III, was created Duke of Clarence and St Andrews in 1789. When the Prince ascended to the Throne as William IV, all his titles merged with the Crown. Prince Albert Victor, the eldest son and heir of the Prince of Wales (later Edward VII), was created the Duke of Clarence and Avondale in 1890. The Prince died unmarried and without issue, upon which his titles became extinct.
For a brief period, from 1890 to 1892, the titles of Earl of Clarence and Duke of Clarence
co-existed at the same time, their respective holders being Charles Edward, Duke of Saxe-Coburg and Gotha (as well as 2nd Duke of Albany, 2nd Earl of Clarence and 2nd Baron Arklow) and Prince Albert Victor, the Duke of Clarence and Avondale.
New royal dukedoms can be created in the peerage of the United Kingdom; it is entirely upon the will of the Sovereign. For all it matters, the Queen (or King Charles) could theoretically create Harry The Duke of London. It isn't very likely though; the second son of the Monarch (or future Monarch) is likely to be given a title with great royal provenance. The Duke of Suffolk is possible but again not probable; it has never been a royal Dukedom and its last holder (Henry Grey, Duke of Suffolk and Marquess of Dorset - Lady Jane Grey's father) was executed for treason.
Of all the royal Dukedoms in English/British history, the following are currently vacant (excluding the suspended ones):
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Clarence
Last separate creation was in 1461 for George Plantagenet, last joint creation was for Prince Albert Victor, Duke of Clarence and Avondale in 1890.
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Sussex
The first and only creation was for Prince Augustus Frederick, sixth son of George III, who died with no legitimate issue.
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Windsor
The first and only creation was for Prince Edward - former Edward VIII - in 1937, who died with no legitimate issue.
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Albemarle
The only royal creation was in 1397 for Edward of Norwich, a grandson of Edward III. The titles was recreated in 1660, following the Restoration for George Monck - a key figure in the process of restoration. There were also Jacobite creations (recognised only by the supporters of the Jacobite claimants) for Henry FitzJames - illegitimate son of James II, and George Granville, 1st Baron Lansdowne - a notable politician.
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Ross
The title of Duke of Ross was created twice in the peerage of Scotland, both times for the younger sons of the King of Scotland. The first creation was in 1488 for the James Stewart, the second son of James III of Scotland. The second and last creation was in 1514 for the fourth son of James IV of Scotland who died in infancy.
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Kendal
The title Duke of Kendal was created for the first time in 1666 for Charles Stuart, the son of Prince James, Duke of York (future James II) and Anne Hyde; he died just months later. The second creation was, quite unusually, for a woman: Melusine von der Schulenburg - a long time mistress of George I - was created Duchess of Kendal in its second creation in 1719.
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Hereford
The first and only creation of the title was in 1397 for Henry Bolingbroke, the eldest son of John Gaunt (himself the son of Edward III). When Henry Bolingbroke ascended to the English Throne as Henry IV, the title merged with the Crown.
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Connaught (only used as a two-territorial title in combination with another dukedom)
The title of Duke of Connaught and Strathearn was created in 1874 for Prince Arthur, Queen Victoria's third son. It became extinct in 1943 with the death of Alastair Windsor, 2nd Duke of Connaught and Strathearn.
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St Andrews (only used as a two-territorial title in combination with another dukedom)
Prince William, the third son of George III, was created Duke of Clarence and St Andrews in 1789. When the Prince ascended to the Throne as William IV, all his titles merged with the Crown.
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Strathearn (only used as a two-territorial title in combination with another dukedom)
This Dukedom was never awarded by itself but always in combination with another dukedom. The title of Duke of Connaught and Strathearn was created in 1874 for Prince Arthur, Queen Victoria's third son. Prince Edward (fourth son of George III and the father of Queen Victoria) was created Duke of Kent and Strathearn in 1799. Prince Henry (fourth son of Frederick, Prince of Wales, himself the son of George II) was created Duke of Cumberland and Strathearn in 1766.
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Avondale (only used as a two-territorial title in combination with another dukedom)
Prince Albert Victor (the eldest son of the Prince of Wales - later Edward VII) was created Duke of Clarence and Avondale in 1890.
Of the Dukedoms listed above, the following are highly unlikely to be created for Prince Harry:
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Strathearn (since Prince William has already been created Earl of Strathearn)
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Windsor (no one needs reminder of the abdication crisis)
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Albemarle (because of all the issues with Jacobite creations)
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Kendal (because the last creation was for the King's mistress)
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Avondale (the last holder - Prince Albert Victor, was rumoured to be Jack the Ripper, The title was never used separately and only with conjecture with another dukedom)
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Clarence (again, unfortunate associations. Also, the title was never used separately and only with conjecture with another dukedom)
Of the Dukedoms listed above, the following are likely to be created for Prince Harry:
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Ross (the most likely Dukedom in my opinion, especially taking into consideration the Scottish independence movement)
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Sussex (no major scandals or controversies connected with this one)
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Hereford (reminder of War of Roses, but otherwise pretty clean)
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Connaught (no major controversies but never used as a separate title and only with conjecture with another dukedom)
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St Andrews (largely scandal free, however never used as a separate title and only with conjecture with another dukedom)