Biography of David Wemyss 4th Earl Wemyss 1678-1720
Paternal Family Tree: Wemyss aka Charteris
Maternal Family Tree: Catherine Balsac Duchess Lennox
On 28 Mar 1672 [his father] James Wemyss 1st Lord Burntisland (age 15) and [his mother] Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 13) were married. She the daughter of David Wemyss 2nd Earl Wemyss (age 61) and Margaret Leslie Countess Buccleuch and Wemyss (age 51). She a great x 5 granddaughter of King Henry VII of England and Ireland. 
In Apr 1672 [his father] James Wemyss 1st Lord Burntisland (age 15) was created 1st Lord Burntisland. [his mother] Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 13) by marriage Lord Burntisland.
In 1678 David Wemyss 4th Earl Wemyss was born to James Wemyss 1st Lord Burntisland (age 21) and Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 18).
In Jul 1679 [his grandfather] David Wemyss 2nd Earl Wemyss (age 68) died at Wemyss Castle. His daughter [his mother] Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 20) succeeded 3rd Countess Wemyss. [his father] James Wemyss 1st Lord Burntisland (age 22) by marriage Earl Wemyss.
In Dec 1682 [his father] James Wemyss 1st Lord Burntisland (age 25) died.
After Dec 1682 [his step-father] George Mackenzie 1st Earl Cromartie (age 52) and [his mother] Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 23) were married. The difference in their ages was 29 years. She the daughter of David Wemyss 2nd Earl Wemyss and Margaret Leslie Countess Buccleuch and Wemyss (age 62). She a great x 5 granddaughter of King Henry VII of England and Ireland.
On 13 Aug 1697 David Wemyss 4th Earl Wemyss (age 19) and Anne Douglas were married. She the daughter of William Douglas 1st Duke Queensberry and Isabel Douglas Countess Queensberry. He the son of James Wemyss 1st Lord Burntisland and Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 38). They were third cousin once removed.
On 30 Aug 1699 [his son] James Wemyss 5th Earl Wemyss was born to David Wemyss 4th Earl Wemyss (age 21) and [his wife] Anne Douglas.
On 23 Feb 1700 [his wife] Anne Douglas died when her clothes caught fire.
On 11 Mar 1705 [his mother] Margaret Wemyss Countess Cromartie 3rd Countess Wemyss (age 46) died. Her son David Wemyss 4th Earl Wemyss (age 27) succeeded 4th Earl Wemyss.
On 02 Sep 1705 [his former brother-in-law] William Douglas died.
On 05 Jan 1709 David Wemyss 4th Earl Wemyss (age 31) and Mary Robinson were married at St Martin in the Fields [Map]. He the son of James Wemyss 1st Lord Burntisland and Margaret Wemyss Countess Cromartie 3rd Countess Wemyss.
In 1712 [his wife] Mary Robinson died.
In Jul 1716 David Wemyss 4th Earl Wemyss (age 38) and Elizabeth St Clair were married. He the son of James Wemyss 1st Lord Burntisland and Margaret Wemyss Countess Cromartie 3rd Countess Wemyss.
In 1718 [his daughter] Elizabeth Wemyss Countess Sutherland was born to David Wemyss 4th Earl Wemyss (age 40) and [his wife] Elizabeth St Clair.
In or after 1719 [his daughter] Margaret Wemyss Countess Moray was born to David Wemyss 4th Earl Wemyss (age 41) and [his wife] Elizabeth St Clair..
In 1720 David Wemyss 4th Earl Wemyss (age 42) died. His son [his son] James Wemyss 5th Earl Wemyss (age 20) succeeded 5th Earl Wemyss.
In 1721 [his former wife] Elizabeth St Clair died.
Kings Wessex: Great x 19 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 15 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 21 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 16 Grand Son of Maredudd ap Bleddyn King Powys
Kings England: Great x 6 Grand Son of King Henry VII of England and Ireland
Kings Scotland: Great x 11 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 16 Grand Son of Louis VII King Franks
Kings France: Great x 9 Grand Son of Charles "Beloved Mad" VI King France
GrandFather: James Wemyss
David Wemyss 4th Earl Wemyss 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: David Wemyss
Great x 2 Grandfather: John Wemyss
Great x 4 Grandfather: William Ruthven 2nd Lord Ruthven
Great x 3 Grandmother: Cecilia Ruthven
Great x 4 Grandmother: Janet Halyburton Lady Dirletoun
Great x 1 Grandfather: John Wemyss 1st Earl Wemyss 8 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: James Stewart of Beath
9 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: James Stewart 1st Lord Doune 9 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Margaret Lindsay 8 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: Mary Stewart 7 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Archibald Campbell 4th Earl Argyll 5 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Margaret Campbell 6 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Margaret Graham Countess Argyll
9 x Great Grand Daughter of King John "Lackland" of England
GrandFather: David Wemyss 2nd Earl Wemyss 4 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Patrick Gray 4th Lord Gray 11 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Patrick Gray 5th Lord Gray 11 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Marion Ogilvy 10 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandfather: Patrick Gray 6th Lord Gray 12 x Great Grand Son of King John "Lackland" of England
Great x 1 Grandmother: Jane Gray Countess Wemyss 3 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: King James V of Scotland Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Robert Stewart 1st Earl Orkney Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Euphame Elphinstone
Great x 2 Grandmother: Mary Stewart Lady Gray 2 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Gilbert Kennedy 3rd Earl Cassilis 10 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandmother: Jean Kennedy Countess Orkney 11 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandmother: Margaret Kennedy Countess Cassilis 10 x Great Grand Daughter of King John "Lackland" of England
Mother: Margaret Wemyss Countess Cromartie 3rd Countess Wemyss 5 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: George Leslie 4th Earl Rothes
Great x 3 Grandfather: Andrew Leslie 5th Earl Rothes
Great x 2 Grandfather: James Leslie Master of Rothes
Great x 1 Grandfather: John Leslie 6th Earl Rothes
GrandMother: Margaret Leslie Countess Buccleuch and Wemyss 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John Erskine 17th Earl Mar 9 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: John Erskine 18th Earl Mar 10 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Margaret Campbell Countess Mar 9 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandfather: John Erskine 19th Earl Mar 11 x Great Grand Son of King John "Lackland" of England
Great x 1 Grandmother: Anne Erskine Countess of Rothes 7 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John Stewart Duke Orkney
4 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Esme Stewart 1st Duke Lennox 5 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Queuille Lady Aubigny
Great x 2 Grandmother: Mary Stewart Countess Mar
6 x Great Grand Daughter of King Edward III of England
Great x 3 Grandmother: Catherine Balsac Duchess Lennox