The Duke of Somerset, of the Lancastrian party, is one of the younger members of the English nobility, who has an ongoing feud with the Duke of York (see Henry VI, Part One) and dislikes the Duke of Gloucester.
He joins with the Cardinal to help overthrow the latter, but also makes plans with Buckingham to rid themselves of the Cardinal as well. Named Regent of the English possessions in France, he is badly beaten by the French. His proximity to the King on his return provides an excuse for York to return with his army from Ireland; Somerset agrees to put himself into custody to calm York down, but his appearance at liberty drives the Duke to openly publish his rebellion. His further adventures are chronicled in Henry VI, Part Three.