On 18 Aug 1580 [her grandfather] Robert Douglas Earl Buchan 1540-1580 (age 40) died. His son [her father] James Douglas 5th Earl Buchan 1580-1601 succeeded 5th Earl Buchan.
Around 1601 Mary Douglas 6th Countess Buchan was born to James Douglas 5th Earl Buchan 1580-1601 (age 21).
On 26 Aug 1601 [her father] James Douglas 5th Earl Buchan 1580-1601 (age 21) died. His daughter Mary Douglas 6th Countess Buchan succeeded 6th Countess Buchan.
On 18 Jun 1615 James Erskine Earl Buchan 1594-1640 (age 21) and Mary Douglas 6th Countess Buchan (age 14) were married. He by marriage Earl Buchan. She the daughter of James Douglas 5th Earl Buchan 1580-1601. He the son of John Erskine 19th Earl Mar (age 53) and Mary Stewart Countess Mar 1582-1644 (age 33). They were second cousin once removed.
Before 1626 Thomas Hamilton 2nd Earl Haddington 1600-1640 (age 25) and [her sister-in-law] Catherine Erskine were married. She the daughter of John Erskine 19th Earl Mar (age 63) and Mary Stewart Countess Mar 1582-1644 (age 43). He the son of Thomas Hamilton 1st Earl Haddington 1563-1637 (age 62).
In 1628 Mary Douglas 6th Countess Buchan (age 27) died at Holyrood Palace, Holyrood.
In or after 1628 [her former husband] James Erskine Earl Buchan 1594-1640 (age 34) and Dorothy Knyvet were married. He the son of John Erskine 19th Earl Mar (age 66) and Mary Stewart Countess Mar 1582-1644 (age 46).
In Jan 1640 [her former husband] James Erskine Earl Buchan 1594-1640 (age 46) died.
Paternal Family Tree: Douglas
Kings Wessex: Great x 17 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 14 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 20 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 15 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 8 Grand Daughter of King Edward III of England
Kings Scotland: Great x 10 Grand Daughter of Robert "The Bruce" I King Scotland
Kings Franks: Great x 14 Grand Daughter of Louis VII King Franks
Kings France: Great x 10 Grand Daughter of Philip "The Fair" IV King France
Great x 4 Grandfather: Robert Douglas of Lochleven
Great x 3 Grandfather: Robert Douglas
Great x 2 Grandfather: Thomas Douglas
Great x 3 Grandmother: Margaret Countess Balfour Douglas
Great x 1 Grandfather: Robert Douglas
Great x 2 Grandmother: Elizabeth Boyd
GrandFather: Robert Douglas Earl Buchan 1540-1580 11 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: Alexander Erksine 3rd Lord Erskine 15th Earl Mar 7 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: Robert Erskine 4th Lord Erskine 16th Earl Mar 8 x Great Grand Son of King John "Lackland" of England
Great x 2 Grandfather: John Erskine 17th Earl Mar 1487-1555 9 x Great Grand Son of King John "Lackland" of England
Great x 1 Grandmother: Margaret Erskine 10 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: Colin Campbell 1st Earl Argyll 7 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: Archibald Campbell 2nd Earl Argyll 1449-1513 8 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Isabella Stewart Countess Argyll
7 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: Margaret Campbell Countess Mar 9 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: John Stewart 1st Earl Lennox 1429-1495 13 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Elizabeth Stewart Countess Argyll 1463- 14 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Margaret Montgomerie Countess Lennox
Father: James Douglas 5th Earl Buchan 1580-1601 7 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: James Stewart 1st Earl Buchan 1442-1499 2 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Alexander Stewart 2nd Earl Buchan -1505 3 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: John Stewart 3rd Earl Buchan 1498-1551 4 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Ruthven 1st Lord Ruthven
Great x 3 Grandmother: Margaret Ruthven Countess Buchan 15 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandmother: Christian Forbes Lady Ruthven 14 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 1 Grandfather: John Stewart 5 x Great Grand Son of King Edward III of England
GrandMother: Christina Stewart 4th Countess Buchan 1548-1580 6 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Walter Ogilvy
Great x 1 Grandmother: Margaret Ogilvy
Mary Douglas 6th Countess Buchan 1601-1628 8 x Great Grand Daughter of King Edward III of England