On 28 Nov 1627 [her father] Arthur Capell 1st Baron Capell Hadham (age 19) and [her mother] Elizabeth Morrison Baroness Capell Hadham (age 16) were married.

On 28 Jun 1648 Henry Seymour (age 22) and 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.

Before 25 Dec 1660 Henry Somerset 1st Duke Beaufort (age 31) and Mary Capell Duchess Beaufort (age 30) were married. He the son of Edward Somerset 2nd Marquess Worcester (age 58) and Elizabeth Dormer.

On 07 May 1661 Charles Boyle 3rd Baron Clifford (age 21) and [her former sister-in-law] 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.

On 31 Aug 1676 [her son-in-law] Thomas Bruce 3rd Earl Elgin 2nd Earl Ailesbury (age 20) and [her daughter] Elizabeth Seymour Countess Elgin and Ailesbury (age 21) were married. She the daughter of Henry Seymour and Mary Capell Duchess Beaufort (age 45). He the son of Robert Bruce 2nd Earl Elgin 1st Earl Ailesbury (age 50). They were fourth cousins. She a great x 5 granddaughter of King Henry VII of England and Ireland.

On 06 Jun 1682 [her son] Charles Somerset Marquess Worcester (age 21) and [her daughter-in-law] Rebecca Child Marchioness Worcester (age 16) were married. He the son of Henry Somerset 1st Duke Beaufort (age 53) and Mary Capell Duchess Beaufort (age 51).

In 1685 [her son-in-law] James Butler 2nd Duke Ormonde (age 19) and [her daughter] Mary Somerset Duchess Ormonde (age 21) were married. She the daughter of Henry Somerset 1st Duke Beaufort (age 56) and Mary Capell Duchess Beaufort (age 54). He the son of Thomas Butler 6th Earl Ossory and Emilia Nassau Beverweert Countess Ossory (age 49).

On 24 Jun 1686 [her son-in-law] Henry Horatio O'Brien and [her daughter] Henrietta Somerset Countess Suffolk (age 17) were married. She the daughter of Henry Somerset 1st Duke Beaufort (age 57) and Mary Capell Duchess Beaufort (age 55). He the son of Henry O'Brien 7th Earl Thomond (age 66) and Sarah Russell Countess Thomond (age 48).

In 1691 [her son-in-law] Thomas Coventry 2nd Earl Coventry (age 29) and [her daughter] Anne Somerset Countess Coventry (age 17) were married. She the daughter of Henry Somerset 1st Duke Beaufort (age 62) and Mary Capell Duchess Beaufort (age 60). He the son of Thomas Coventry 1st Earl Coventry (age 62) and Winifred Edgecumbe (age 54).

In 1695 [her son] Arthur Somerset (age 23) and [her daughter-in-law] Mary Russell (age 26) were married. He the son of Henry Somerset 1st Duke Beaufort (age 66) and Mary Capell Duchess Beaufort (age 64).

In Apr 1705 [her son-in-law] Henry Howard 6th Earl Suffolk (age 35) and [her daughter] Henrietta Somerset Countess Suffolk (age 36) were married. She the daughter of Henry Somerset 1st Duke Beaufort and Mary Capell Duchess Beaufort (age 74). He the son of Henry Howard 5th Earl Suffolk (age 77) and Mary Stewart.