In 1583 Philip Sidney (age 28) and [her mother] Frances Walsingham Countess Essex (age 16) were married.

In 1590 [her father] Robert Devereux 2nd Earl Essex (age 24) and [her mother] Frances Walsingham Countess Essex (age 23) were married. She by marriage Countess Essex. He the son of Walter Devereux 1st Earl Essex and Lettice Knollys Countess Essex (age 46).

In 1603 [her step-father] Richard Burke 4th Earl Clanricarde 1st Earl St Albans (age 31) and [her mother] Frances Walsingham Countess Essex (age 36) were married. He the son of Ulrick Burke 3rd Earl Clanricarde.

On 22 Jun 1610 [her future husband] William Seymour 2nd Duke Somerset (age 22) and Arabella Stewart (age 35) were married in secret at Palace of Placentia, Greenwich [Map]. For having married without permission King James I of England and Ireland and VI of Scotland (age 44) had Arabella Stewart (age 35) imprisoned in Sir Thomas Perry's House Lambeth, Surrey and he in the Tower of London [Map]. She the daughter of Charles Stewart 5th Earl Lennox and Elizabeth Cavendish Countess Lennox. They were third cousin once removed. He a great x 3 grandson of King Henry VII of England and Ireland. She a great x 2 granddaughter of King Henry VII of England and Ireland.

Before 23 Jul 1611 Ferdinando Dudley (age 23) and [her future sister-in-law] Honora Seymour (age 18) were married. They were third cousin once removed. She a great x 3 granddaughter of King Henry VII of England and Ireland.

In 1613 [her future brother-in-law] Francis Seymour 1st Baron Seymour Trowbridge (age 23) and Frances Prynne were married. He a great x 3 grandson of King Henry VII of England and Ireland.

Before 1616 [her future brother-in-law] Edward Seymour (age 30) and Anne Sackville were married. She the daughter of Robert Sackville 2nd Earl Dorset and Margaret Howard. They were third cousins. He a great x 3 grandson of King Henry VII of England and Ireland.

On 03 Mar 1617 William Seymour 2nd Duke Somerset (age 29) and Frances Devereux Duchess of Somerset (age 17) were married at Drayton Bassett, Staffordshire [Map]. She the daughter of Robert Devereux 2nd Earl Essex and Frances Walsingham Countess Essex (age 50). They were fourth cousins. He a great x 3 grandson of King Henry VII of England and Ireland.

In 1635 [her brother-in-law] Francis Seymour 1st Baron Seymour Trowbridge (age 45) and Catherine Lee Baroness Seymour Trowbridge were married. He a great x 3 grandson of King Henry VII of England and Ireland.

Around 1637 [her son-in-law] Richard Molyneux 2nd Viscount Molyneux (age 18) and [her daughter] Frances Seymour Countess Southampton (age 19) were married. She by marriage Viscountess Molyneux. She the daughter of William Seymour 2nd Duke Somerset (age 49) and Frances Devereux Duchess of Somerset (age 37). She a great x 4 granddaughter of King Henry VII of England and Ireland.

On 28 Jun 1648 [her son] Henry Seymour (age 22) and [her daughter-in-law] Mary Capell Duchess Beaufort (age 17) were married at Little Hadham, Hertfordshire [Map]. He the son of William Seymour 2nd Duke Somerset (age 60) and Frances Devereux Duchess of Somerset (age 48). They were fourth cousins. He a great x 4 grandson of King Henry VII of England and Ireland.

Around 1650 [her son-in-law] Heneage Finch 3rd Earl Winchilsea (age 22) and [her daughter] Mary Seymour Countess Winchelsea (age 13) were married. She by marriage Countess Winchilsea. She the daughter of William Seymour 2nd Duke Somerset (age 62) and Frances Devereux Duchess of Somerset (age 50). He the son of Thomas Finch 2nd Earl Winchilsea and Cecily Wentworth Countess Winchelsea. They were third cousins. She a great x 4 granddaughter of King Henry VII of England and Ireland.

In 1656 [her son] John Seymour 4th Duke Somerset (age 11) and [her daughter-in-law] Sarah Alston Duchess Somerset (age 14) were married. He the son of William Seymour 2nd Duke Somerset (age 68) and Frances Devereux Duchess of Somerset (age 56). He a great x 4 grandson of King Henry VII of England and Ireland.

On 07 May 1659 [her son-in-law] Thomas Wriothesley 4th Earl of Southampton 2nd Earl Chichester (age 52) and [her daughter] Frances Seymour Countess Southampton (age 41) were married. She by marriage Countess of Southampton. She the daughter of William Seymour 2nd Duke Somerset (age 71) and Frances Devereux Duchess of Somerset (age 59). He the son of Henry Wriothesley 3rd Earl of Southampton and Elizabeth Vernon Countess Southampton. She a great x 4 granddaughter of King Henry VII of England and Ireland.

On 07 May 1661 [her son-in-law] Charles Boyle 3rd Baron Clifford (age 21) and [her daughter] Jane Seymour Baroness Clifford (age 24) were married. She the daughter of William Seymour 2nd Duke Somerset and Frances Devereux Duchess of Somerset (age 61). He the son of Richard Boyle 2nd Earl Cork 1st Earl Burlington (age 48) and Elizabeth Clifford Countess Burlington (age 47). She a great x 4 granddaughter of King Henry VII of England and Ireland.