The title of Marquess of Worcester is a British noble title that was created in 1642. It is part of the Peerage of England and is associated with the Duke of Beaufort family. The title was first granted to Henry Somerset, who was a prominent royalist during the English Civil War. The Marquesses of Worcester have historically held significant land and influence in Worcestershire and Monmouthshire. The family is known for its contributions to the arts and sciences, particularly through Henry Somerset, 5th Duke of Beaufort, who was an early advocate of steam power and a supporter of various scientific endeavors.