Sir John Seymour, Knight banneret was an English soldier and a courtier who served both Henry VII and Henry VIII. Born into a prominent gentry family, he is best known as the father of Henry VIII's third wife, Jane Seymour, and hence grandfather of king Edward VI of England.

In common parlance, the wives of Henry VIII were the six queens consort of King Henry VIII of England between 1509 and his death in 1547. In legal terms, Henry had only three wives, because three of his marriages were annulled by the Church of England. He was never granted an annulment by the Pope, as he desired, however, for Catherine of Aragon, his first wife. Annulments declare that a true marriage never took place, unlike a divorce, in which a married couple end their union. Along with his six wives, Henry took several mistresses.