Katherine Swynford, Duchess of Lancaster (1350 – 1403) (also spelt Katharine or Catherine). Third wife of John of Gaunt, Duke of Lancaster, a son of King Edward III. Henry VII, who became King of England in 1485, derived his claim to the throne from his mother Margaret Beaufort, who was a great-granddaughter of Gaunt and Katherine Swynford.
"Katherine was documented as having large gray eyes, very long lashes,
very long, dark red hair, white unblemished skin, beautiful teeth and
was, indeed a beautiful young girl by any standards." http://www.picturesofengland.com/…/Lincoln_Cat…/article/1043