sentences:  Lady Katherine Grey
  
  Katherine Seymour, Countess of Hertford (25 August 1540 – 26 January 1568), born Lady Katherine Grey, was a younger sister of Lady Jane Grey.A granddaughter of Henry VIII's sister Mary, she emerged as a prospective successor to her cousin, Elizabeth I of England, before incurring Queen Elizabeth's wrath by secretly marrying Edward Seymour, 1st Earl of Hertford.