Cecily Bonville, 7th Baroness Harington
Cecily Bonville, 7th Baroness Harington, 2nd Baroness Bonville (30 June 1460 – 12 May 1529) was an English peer, who was also Marchioness of Dorset by her first marriage to Thomas Grey, 1st Marquess of Dorset, and Countess of Wiltshire by her second marriage to Henry Stafford, 1st Earl of Wiltshire.
The Bonvilles were loyal supporters of the House of York during the series of dynastic civil wars that were fought for the English throne, known as the Wars of the Roses (1455–1487).
When she was less than a year old, Cecily became the wealthiest heiress in England after her male relatives were slain in battle, fighting against the House of Lancaster.
Cecily's life after the death of her first husband in 1501 was marked by an acrimonious dispute with her son and heir, Thomas Grey, 2nd Marquess of Dorset.
This was over Cecily's right to remain sole executor of her late husband's estate and to control her own inheritance, both of which Thomas challenged following her second marriage to Henry Stafford; a man many years her junior.
Their quarrel required the intervention of King Henry VII and the royal council.
Lady Jane Grey, Lady Catherine Grey and Lady Mary Grey were her great-granddaughters.
All three were in the Line of Succession to the English throne.
Jane, the eldest, reigned as queen for nine days in July 1553.
John Grey of Groby
Sir John Grey, of Groby, Leicestershire (c. 1432 – 17 February 1461) was a Lancastrian knight, the first husband of Elizabeth Woodville who later married King Edward IV of England, and great-great-grandfather of Lady Jane Grey.
Thomas Grey, 2nd Marquess of Dorset
Thomas Grey, 2nd Marquess of Dorset( 22 June 147710 October 1530) was an English peer, courtier, soldier, and landowner.
Eleanor Grey
Lady Eleanor Grey( died before December 1503), was an English noblewoman, and the first wife of Sir John Arundell of Lanherne in Cornwall," the most important man in the county", being Receiver- General of the Duchy of Cornwall.
Their monumental brass in the church at St Columb Major in Cornwall was described by Dunkin( 1882) as" perhaps the most elaborate and interesting brass to be found in Cornwall."
Her father was Thomas Grey, 1st Marquess of Dorset.
Lady Eleanor was an ancestor of the later Barons Arundell of Wardour.
Margaret Audley, Duchess of Norfolk
Margaret Howard (née Audley), Duchess of Norfolk (1540 – 9 January 1564) was the sole surviving child of Thomas Audley, 1st Baron Audley of Walden and Lady Elizabeth Grey, daughter of Thomas Grey, 2nd Marquess of Dorset and Margaret Wotton.
Thomas Grey, 1st Marquess of Dorset
Thomas Grey, 1st Marquess of Dorset, 1st Earl of Huntingdon, 7th Baron Ferrers of Groby, (145520 September 1501) was an English nobleman, courtier and the eldest son of Elizabeth Woodville and her first husband Sir John Grey of Groby.
Her second marriage to King Edward IV made her Queen of England, thus elevating Grey's status at court and in the realm as the stepson of the King.
Through his mother's assiduous endeavours, he made two materially advantageous marriages to wealthy heiresses, the King's niece Anne Holland and Cecily Bonville, 7th Baroness Harington.
By the latter he had 14 children.
Henry Grey, 1st Earl of Stamford
Henry Grey, 1st Earl of Stamford( 1599 – 21 August 1673), known as the Lord Grey of Groby from 1614 to 1628, was an English nobleman and military leader.
He was the eldest son of Sir John Grey and Elizabeth Nevill.
His mother was probably a daughter of Edward Nevill, 8th Baron Bergavenny( died 1622) and his wife Rachel Lennard.
Henry succeeded his paternal grandfather, Henry Grey, 1st Baron Grey of Groby, as second Baron Grey of Groby in July 1614.
His paternal grandmother was Anne Windsor, youngest daughter of William Windsor, 2nd Baron Windsor and his first wife Margaret Sambourne.
His great- grandfather Lord John Grey of Pirgo was son of Thomas Grey, 2nd Marquess of Dorset and younger brother of Henry Grey, 1st Duke of Suffolk.
Elizabeth Grey, Countess of Kildare
Elizabeth Grey, Countess of Kildare( c.1497- after 1548), was an English noblewoman, and the second wife of Irish peer Gerald FitzGerald, 9th Earl of Kildare.
Her father was Thomas Grey, 1st Marquess of Dorset.
She went to France in 1514 as one of the Maids of Honour of Mary Tudor, Queen of France, and remained to serve the latter's successor, Queen Claude, in the same capacity.
Margaret Wotton, Marchioness of Dorset
Margaret Wotton, Marchioness of Dorset( 1485 –6 Oct 1535) was the second wife of Thomas Grey, 2nd Marquess of Dorset, and the mother of his children, including Henry Grey, 1st Duke of Suffolk, with whom she engaged in many quarrels during his minority over money and his allowance.
Her lack of generosity to Henry shocked her peers as unmotherly, and inappropriate behaviour toward a high- ranking nobleman, relative of King Henry VIII of England.
In 1534, she was compelled to answer to the charges that she was an" unnatural mother".
On 10 September 1533, she stood as one of the godmothers of the future Queen Elizabeth I of England.
She was the subject of two portraits by Hans Holbein the Younger.
One of her many grandchildren was Lady Jane Grey.
Jane Shore
Elizabeth" Jane" Shore(" née" Lambert)( c. 1445 – c. 1527) was one of the many mistresses of King Edward IV of England, one of three whom he described as" the merriest, the wiliest, and the holiest harlots" in his realm.
She also became a concubine to other noblemen, including Edward's stepson, Thomas Grey, 1st Marquess of Dorset, and William Hastings, 1st Baron Hastings, his close friend and adviser.

Question: When did Thomas Grey, 1St Marquess Of Dorset's father die?
Answer: 17 February 1461