On 25 May 1553 a triple wedding was celebrated at Durham Place, the London townhouse of John Dudley 1st Duke Northumberland (age 49), father of Guildford Dudley (age 18) and Katherine Dudley Countess Huntingdon (age 15) ...

Guildford Dudley (age 18) and Lady Jane Grey (age 17) were married. She the daughter of Henry Grey 1st Duke of Suffolk (age 36) and Frances Brandon Duchess of Suffolk (age 35). He the son of John Dudley 1st Duke Northumberland (age 49) and Jane Guildford Duchess Northumberland (age 44). They were third cousin once removed. She a great granddaughter of King Henry VII of England and Ireland.

Henry Hastings 3rd Earl Huntingdon (age 18) and Katherine Dudley Countess Huntingdon (age 15) were married. She the daughter of John Dudley 1st Duke Northumberland (age 49) and Jane Guildford Duchess Northumberland (age 44). He the son of Francis Hastings 2nd Earl Huntingdon (age 39) and Catherine Pole Countess Huntingdon (age 42).

Henry Herbert 2nd Earl Pembroke (age 15) and Catherine Grey Countess Hertford (age 12) were married. She the daughter of Henry Grey 1st Duke of Suffolk (age 36) and Frances Brandon Duchess of Suffolk (age 35). He the son of William Herbert 1st Earl Pembroke (age 52) and Anne Parr Countess Pembroke. They were fourth cousins. She a great granddaughter of King Henry VII of England and Ireland.