On 23 May 1644 Alice Leigh 1st Duchess Dudley (age 66) was created 1st Duke Dudley by King Charles I of England, Scotland and Ireland (age 43) for life. Her husband Robert Dudley (age 69) had claimed to be the legitimate son of Robert Dudley 1st Earl of Leicester but the Star Chamber found against him. King Charles I of England, Scotland and Ireland (age 43) disagreed with their verdict and, in compensation of her subsequent treatment, awarded her the Dukedom ...

And whereas, our father not knowing the truth of the lawful birth of the said Sir Robert (as we piously believe) granted away the titles of the said earldom to others ... and holding ourselves in honour and conscience obliged to make reparation; and also the said great estate which the Lady Alice had in Kenilworth, and sold at our desire to us at a very great undericon... we do... give and grant unto the said Lady Alice Dudley the title of Duchess of Dudley for life.

In 1670 Barbara Villiers 1st Duchess of Cleveland (age 29) was created 1st Duke Cleveland, 1st Earl of Southampton and 1st Baron Nonsuch by King Charles II of England Scotland and Ireland (age 39) for having given birth to five of his illegitimate children.

On 19 Aug 1673 Louise Kéroualle 1st Duchess Portsmouth (age 23) was created 1st Duke Portsmouth, 1st Earl Fareham, 1st Baron Petersfield by King Charles II of England Scotland and Ireland (age 43) for life for being his mistress and for having given birth to his son Charles Lennox 1st Duke Richmond (age 1).

On 19 Mar 1719 Melusine Schulenburg 1st Duchess Munster 1st Duchess Kendal (age 51) was created 1st Duke Kendal, 1st Earl Feversham, 1st Baron Glastonbury.