The "Dukes of Hereford" is a title in the British peerage, associated with the county of Herefordshire. The title was first created in 1703 for Henry de Vere, 20th Earl of Oxford, and has since been held by various members of the House of Lancaster and House of York during the English Wars of the Roses. The title has a rich history, with notable holders including Henry Bolingbroke, who became King Henry IV of England. The Dukes of Hereford have played significant roles in English history, particularly during the medieval period, influencing politics and royal succession.