Katherine married John Howard, 1st. Duke of Norfolk about 1443. John (son of Sir Robert Howard and Lady Margaret de Mowbray) was born about 1425 in Stoke by Nayland, Suffolk, England; died on 22 Aug 1485 in Battle of Bosworth Field, Leicestershire, England; was buried in Thetford Priory, Norfolk, England. [Group Sheet]

1. Thomas Howard, 2nd. Duke of Norfolk was born in 1443; died on 21 May 1524 in Thetford Priory, Norfolk, England.
2. Lady Margaret Howard was born about 1450 in Stoke by Nayland, Suffolk, England; died before 1485.