On 19 Aug 1565 Thomas Keyes (age 41) and Mary Grey (age 20) were married. Elizabeth Stafford (age 19) and Ursula Stafford (age 12) were witnesses. The difference in their ages was 21 years. She the daughter of Henry Grey 1st Duke of Suffolk and Frances Brandon Duchess of Suffolk. She a great granddaughter of King Henry VII of England and Ireland.