Sarah Lennox (18 September 1705 – 25 August 1751), was born Sarah Cadogan as the eldest daughter of William Cadogan (since 1716 1st Baron Cadogan of Reading and since 1722 1st Earl Cadogan) and his wife Margaret Cecilia Munter.
 On 4 December 1719, she married Charles Lennox, Earl of March at The Hague and in 1723, Charles succeeded to his father's title of Duke of Richmond, whereupon Sarah became Duchess of Richmond.
 Sarah was Lady of the Bedchamber to Queen Caroline from 1724 to 1737.
Field Marshal Charles Lennox, 3rd Duke of Richmond, 3rd Duke of Lennox, 3rd Duke of Aubigny, (22 February 1735 – 29 December 1806), styled Earl of March until 1750, was a British Army officer and politician.
 He associated with the Rockingham Whigs and rose to hold the post of Southern Secretary for a brief period.
 He was noteworthy for his support for the colonists during the American Revolutionary War, his support for a policy of concession in Ireland and his advanced views on the issue of parliamentary reform.
 He went on to be a reforming Master-General of the Ordnance first in the Rockingham ministry and then in the ministry of William Pitt.
General Lord George Henry Lennox (29 November 1737 – 25 March 1805) was a British soldier and politician.
 He was the second son of Charles Lennox, 2nd Duke of Richmond, and was a great-grandson of King Charles II of England.
 He was a brother of the famous Lennox sisters.
Emily FitzGerald, Duchess of Leinster (6 October 1731 – 27 March 1814), known before 1747 as Lady Emily Lennox, from 1747 to 1761 as The Countess of Kildare and from 1761 to 1766 as The Marchioness of Kildare, was the second of the famous Lennox sisters, daughters of Charles Lennox, 2nd Duke of Richmond, and illegitimately descended from King Charles II of England.
Charles Lennox, 1st Duke of Richmond, 1st Duke of Lennox, 1st Duke of Aubigny (29 July 1672 – 27 May 1723) was an English nobleman and politician.
 He was the illegitimate son of King Charles II of England and his mistress Louise de Kérouaille, Duchess of Portsmouth.
Charles II (29 May 1630 – 6 February 1685) was king of England, Scotland and Ireland.
 He was king of Scotland from 1649 until his deposition in 1651, and king of England, Scotland and Ireland from the restoration of the monarchy in 1660 until his death.
Charles Lennox, 4th Duke of Richmond, 4th Duke of Lennox, 4th Duke of Aubigny, (9 December 1764 – 28 August 1819) was a Scottish peer, soldier, politician, and Governor General of British North America.
The Dukedoms of Richmond (in the peerage of England) and of Lennox (in the peerage of Scotland) have usually been held by the same person since 1623.
 In 1675, King Charles II created his illegitimate son Charles Lennox Duke of Richmond (created on 9 August 1675) and Duke of Lennox (created on 9 September 1675), and the two Dukedoms have since been held concurrently by Lennox's descendants.
 Since 1734 he has also held the Dukedom of Aubigny (in the peerage of France).
 Since 1876 he has also held the Dukedom of Gordon (in the peerage of the United Kingdom).
The title Duke of Lennox has been created several times in the Peerage of Scotland, for Clan Stewart of Darnley.
 The Dukedom, named for the district of Lennox in Stirling, was first created in 1581, and had formerly been the Earldom of Lennox.
 The second Duke was made Duke of Richmond; at his death, the dukedom of Richmond became extinct.
 The fourth Duke of Lennox was also created Duke of Richmond; at the death of the sixth Duke, both the dukedoms became extinct.
 The Dukedom of Richmond and one month later that of Lennox were created in 1675 for Charles Lennox, an illegitimate son of Charles II.
 The Duke of Richmond and Lennox was created Duke of Gordon in 1876.
 Thus, the Duke holds four dukedoms (including Aubigny-sur-Nère), more than any other person in the realm.
Charles Lennox, 2nd Duke of Richmond, 2nd Duke of Lennox, 2nd Duke of Aubigny, (18 May 1701 – 8 August 1750) was a British nobleman, peer, and politician.
 He was the son of Charles Lennox, 1st Duke of Richmond, and a grandson of King Charles II.
 He held a number of posts in connection with his high office but is best remembered for his patronage of cricket.
 He has been described as the most important of the sport's early patrons and did much to help its evolution from village cricket to important match status.

Question: When was the deposition of the father of Charles Lennox Duke of Richmond?
Answer: in 1651