In Jul 1654 [his father] William Herbert 1st Marquess Powis (age 28) and [his mother] Elizabeth Somerset Marchioness Powis (age 19) were married. She the daughter of Edward Somerset 2nd Marquess Worcester (age 52) and Elizabeth Dormer. They were fourth cousins.
In 1660 William Herbert 2nd Marquess Powis was born to William Herbert 1st Marquess Powis (age 34) and Elizabeth Somerset Marchioness Powis (age 25).
On 19 Jan 1667 [his grandfather] Percy Herbert 2nd Baron Powis (age 69) died. His son [his father] William Herbert 1st Marquess Powis (age 41) succeeded 3rd Baron Powis of Powis Castle in Powys, 2nd Baronet Powis of Red Castle in Montgomeryshire. [his mother] Elizabeth Somerset Marchioness Powis (age 32) by marriage Baroness Powis of Powis Castle in Powys.
In 1674 [his father] William Herbert 1st Marquess Powis (age 48) was created 1st Earl Powis. [his mother] Elizabeth Somerset Marchioness Powis (age 39) by marriage Countess Powis.
In or before 1685 Hugh Clifford 2nd Baron Clifford Chudleigh (age 22) and [his future sister-in-law] Anne Preston Baroness Clifford were married. She by marriage Baroness Clifford of Chudleigh in Devon.
In 1687 [his father] William Herbert 1st Marquess Powis (age 61) was created 1st Marquess Powis. [his mother] Elizabeth Somerset Marchioness Powis (age 52) by marriage Marchioness Powis.
On 16 Mar 1691 [his mother] Elizabeth Somerset Marchioness Powis (age 56) died.
Around 1695 William Herbert 2nd Marquess Powis (age 35) and Mary Preston Marchioness Powis were married. He the son of William Herbert 1st Marquess Powis (age 69) and Elizabeth Somerset Marchioness Powis. They were third cousin once removed.
On 02 Jun 1696 [his father] William Herbert 1st Marquess Powis (age 70) died. His son William Herbert 2nd Marquess Powis (age 36) succeeded 2nd Marquess Powis, 2nd Earl Powis, 4th Baron Powis of Powis Castle in Powys, 3rd Baronet Powis of Red Castle in Montgomeryshire. [his wife] Mary Preston Marchioness Powis by marriage Marchioness Powis. Mary Preston Marchioness Powis by marriage Marchioness Powis.
In 1698 [his son] William Herbert 3rd Marquess Powis 1698-1748 was born to William Herbert 2nd Marquess Powis (age 38) and [his wife] Mary Preston Marchioness Powis.
After 1698 [his son] Edward Herbert was born to William Herbert 2nd Marquess Powis (age 38) and [his wife] Mary Preston Marchioness Powis.
In 1706 [his daughter] Theresa Herbert Lady Throckmorton was born to William Herbert 2nd Marquess Powis (age 46) and [his wife] Mary Preston Marchioness Powis.
Around 1721 [his son-in-law] Robert Throckmorton 4th Baronet (age 18) and [his daughter] Theresa Herbert Lady Throckmorton (age 15) were married. She the daughter of William Herbert 2nd Marquess Powis 1660-1745 (age 61) and Mary Preston Marchioness Powis.
On 17 Jun 1723 [his daughter] Theresa Herbert Lady Throckmorton (age 17) died.
On 08 Jan 1724 [his wife] Mary Preston Marchioness Powis died.
In 1734 [his son] Edward Herbert (age 35) died.
In 1734 [his son] Edward Herbert (age 35) and [his daughter-in-law] Henrietta Waldegrave (age 17) were married. She the daughter of James Waldegrave 1st Earl Waldegrave (age 50) and Mary Webb Countess Waldegrave 1695-1719. He the son of William Herbert 2nd Marquess Powis 1660-1745 (age 74) and Mary Preston Marchioness Powis. She a great granddaughter of King James II of England Scotland and Ireland. 
On 05 Jul 1734 [his former sister-in-law] Anne Preston Baroness Clifford died.
On 22 Oct 1745 William Herbert 2nd Marquess Powis (age 85) died. His son [his son] William Herbert 3rd Marquess Powis 1698-1748 (age 47) succeeded 3rd Marquess Powis, 3rd Earl Powis, 5th Baron Powis of Powis Castle in Powys, 4th Baronet Powis of Red Castle in Montgomeryshire.
[his daughter] Mary Herbert was born to William Herbert 2nd Marquess Powis and Mary Preston Marchioness Powis.
[his daughter] Charlotte Herbert was born to William Herbert 2nd Marquess Powis and Mary Preston Marchioness Powis.
[his daughter] Anne Herbert Baroness Arundel Wardour was born to William Herbert 2nd Marquess Powis and Mary Preston Marchioness Powis.
Paternal Family Tree: Herbert
Maternal Family Tree: Anne Fitzwilliam 1504-1588
Kings Wessex: Great x 19 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 16 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 21 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 17 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 9 Grand Son of King Edward III of England
Kings Scotland: Great x 14 Grand Son of William "Lion" I King Scotland
Kings Franks: Great x 15 Grand Son of Louis VII King Franks
Kings France: Great x 11 Grand Son of Philip "The Fair" IV King France
Great x 4 Grandfather: Richard Herbert
Great x 3 Grandfather: William Herbert 1st Earl Pembroke
Great x 4 Grandmother: Margaret Cradock
Great x 2 Grandfather: Edward Herbert 6 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Parr
4 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Anne Parr Countess Pembroke 5 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Maud Green Lady in Waiting
7 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 1 Grandfather: William Herbert 1st Baron Powis 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Stanley of Dalgarth in Cumberland
Great x 3 Grandfather: Thomas Stanley
Great x 2 Grandmother: Mary Stanley
Great x 4 Grandfather: John Barrett of Aveley in Essex
Great x 3 Grandmother: Joyce Barrett
GrandFather: Percy Herbert 2nd Baron Powis 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Henry Percy 5th Earl of Northumberland
4 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Thomas Percy 4 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: Henry Percy 8th Earl of Northumberland 5 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Guiscard Harbottle 4 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Eleanor Harbottle 5 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Jane Willoughby
10 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Eleanor Percy Baroness Herbert 6 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John Neville 3rd Baron Latimer 4 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: John Neville 4th Baron Latimer of Snape 5 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Dorothy de Vere
7 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: Katherine Neville Countess Northumberland 6 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Henry Somerset 2nd Earl of Worcester 4 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Lucy Somerset Baroness Latimer Snape 5 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Browne Countess of Worcester
4 x Great Grand Daughter of King Edward III of England
Father: William Herbert 1st Marquess Powis 8 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: William Craven
Great x 1 Grandfather: William Craven
GrandMother: Elizabeth Craven Baroness Herbert
Great x 2 Grandfather: William Whitmore of Balmes Manor in Hackney
Great x 1 Grandmother: Elizabeth Whitmore
Great x 2 Grandmother: Anne Bond
William Herbert 2nd Marquess Powis 1660-1745 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Henry Somerset 2nd Earl of Worcester 4 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: William Somerset 3rd Earl of Worcester 5 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Browne Countess of Worcester 4 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Edward Somerset 4th Earl of Worcester 6 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edward North 1st Baron North
Great x 3 Grandmother: Christina North Countess of Worcester -1558
Great x 4 Grandmother: Alice Squier Baroness North
Great x 1 Grandfather: Henry Somerset 1st Marquess Worcester 1577-1646 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: George Hastings 1st Earl Huntingdon
4 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Francis Hastings 2nd Earl Huntingdon 5 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Stafford Countess Huntingdon
4 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Elizabeth Hastings Countess of Worcester 1546-1621 6 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Henry Pole 1st Baron Montagu 4 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Catherine Pole Countess Huntingdon 5 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Jane Neville Baroness Montagu 4 x Great Grand Daughter of King Edward III of England
GrandFather: Edward Somerset 2nd Marquess Worcester 8 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: John Russell 1st Earl Bedford
Great x 3 Grandfather: Francis Russell 2nd Earl Bedford
Great x 4 Grandmother: Anne Sapcote Countess Bedford
Great x 2 Grandfather: John Russell 9 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: John St John
9 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandmother: Margaret St John Countess Bedford 8 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandmother: Margaret Waldegrave 7 x Great Grand Daughter of King John "Lackland" of England
Great x 1 Grandmother: Anne Russell 2nd Marchioness Worcester 1578-1639 10 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: John Cooke of Gidea Hall
Great x 3 Grandfather: Anthony Cooke
Great x 4 Grandmother: Alice Saunders
Great x 2 Grandmother: Elizabeth Cooke 14 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: William Fitzwilliam
12 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Anne Fitzwilliam 13 x Great Grand Daughter of King Henry I "Beauclerc" England
Mother: Elizabeth Somerset Marchioness Powis 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: William Dormer
Great x 3 Grandfather: Robert Dormer 1st Baron Dormer
Great x 4 Grandmother: Dorothy Catesby
Great x 2 Grandfather: William Dormer 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Anthony Browne 1st Viscount Montagu 5 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Elizabeth Browne Baroness Dormer 6 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Magdalen Dacre Viscountess Montague
5 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Robert Dormer 1st Earl Carnarvon 1610-1643 8 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Molyneux
8 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandfather: Richard Molyneux 1st Baronet 9 x Great Grand Son of King Edward "Longshanks" I of England
Great x 2 Grandmother: Alice Molyneux 10 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: Gilbert Gerard
Great x 3 Grandmother: Frances Gerard Lady Molyneux
Great x 4 Grandmother: Anne Ratclyffe
GrandMother: Elizabeth Dormer 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: William Herbert 1st Earl Pembroke
Great x 3 Grandfather: Henry Herbert 2nd Earl Pembroke 6 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Parr Countess Pembroke 5 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Philip Herbert 4th Earl Pembroke 1st Earl Montgomery 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Henry Sidney
Great x 3 Grandmother: Mary Sidney Countess Pembroke 1561-1621 9 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandmother: Mary Dudley
8 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 1 Grandmother: Anne Sophia Herbert Countess Carnarvon 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John de Vere 16th Earl of Oxford 6 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandfather: Edward de Vere 17th Earl of Oxford 7 x Great Grand Son of King Edward "Longshanks" I of England
Great x 2 Grandmother: Susan Vere Countess Montgomery 8 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: William Cecil 1st Baron Burghley
Great x 3 Grandmother: Anne Cecil Countess of Oxford 15 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Mildred Cooke Baroness Burghley 14 x Great Grand Daughter of King Henry I "Beauclerc" England