Marquess Somerset is in Marquessates of England Alphabetically.
There have been one creations of Marquess Somerset:
1st. 29th September 1397. John Beaufort 1st Marquess Somerset and Dorset. Forfeit. 1399.
Summary
29th September 1397. John Beaufort 1st Marquess Somerset and Dorset [aged 24] created. See Richard II Rewards his Supporters.
1399. John Beaufort 1st Marquess Somerset and Dorset forfeit.
On 29th September 1397 King Richard II [aged 30] rewarded his relations with Dukedoms, possibly for their part in downfall of Thomas of Woodstock 1st Duke of Gloucester [deceased], Thomas Beauchamp 12th Earl Warwick [aged 59] and Richard Fitzalan 9th Earl of Surrey 4th or 11th Earl of Arundel [deceased]...
His older half-brother John Holland 1st Duke Exeter [aged 45] was created 1st Duke Exeter. Elizabeth Lancaster Duchess Exeter [aged 34] by marriage Duchess Exeter.
His nephew Thomas Holland 1st Duke Surrey [aged 23] was created 1st Duke Surrey.
His first cousin once-removed Margaret was created 1st Duchess Norfolk - for life only. On the same day her grandson Thomas [aged 29] was also created Duke of Norfolk - see below.
His second cousin once removed Thomas Mowbray 1st Duke of Norfolk was created 1st Duke Norfolk. Elizabeth Fitzalan Duchess Norfolk [aged 31] by marriage Duchess Norfolk.
His first cousin Edward 2nd Duke of York 1st Duke Albemarle [aged 24] was created 1st Duke Albemarle. Beatrice Burgundy Countess Rutland and Cork [aged 24] by marriage Duchess Albemarle.
His illegitimate first cousin John Beaufort 1st Marquess Somerset and Dorset [aged 24] was created 1st Marquess Somerset, 1st Marquess Dorset. Margaret Holland Duchess Clarence [aged 12] by marriage Marchioness Somerset, Marchioness Dorset.
Ralph Neville 1st Earl of Westmoreland [aged 33] was created 1st Earl of Westmoreland. Joan Beaufort Countess of Westmoreland [aged 18] by marriage Countess of Westmoreland.
In 1399 John Beaufort 1st Marquess Somerset and Dorset [aged 26] was degraded in his titles: Marquess Somerset, Marquess Dorset forfeit. by King Henry V of England [aged 12] as a consequence of his having been a counter-appellant i.e. a supporter of King Richard II who opposed the Lords Appellants.