Around 1424 Archibald Douglas 2nd Duke Touraine (age 34) and [his future wife] Euphemia Graham Lady Hamilton (age 16) were married. She by marriage Duchess Touraine, Countess Wigtown. She the daughter of Patrick Graham and Eupheme Stewart 2nd Countess of Strathearn and Caithness. He the son of Archibald Douglas 1st Duke Touraine (age 52) and Margaret Stewart Duchess Touraine. They were half second cousins.

After 25 Feb 1440 James Hamilton 1st Lord Hamilton (age 25) and Euphemia Graham Lady Hamilton (age 32) were married. She the daughter of Patrick Graham and Eupheme Stewart 2nd Countess of Strathearn and Caithness.

Before 22 Feb 1452 William Douglas 8th Earl Douglas 2nd Earl Avondale (age 27) and [his step-daughter] Margaret "Fair Lady of Galloway" Douglas Countess (age 17) were married. She would later marry his younger brother James Douglas 9th Earl Douglas 3rd Earl Avondale (age 26); an example of Married to Two Siblings. She the daughter of Archibald Douglas 2nd Duke Touraine and Euphemia Graham Lady Hamilton (age 44). He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale (age 54). They were first cousin once removed.

Before 1455 James Douglas 9th Earl Douglas 3rd Earl Avondale (age 29) and [his step-daughter] Margaret "Fair Lady of Galloway" Douglas Countess (age 19) were married. She by marriage Countess Douglas, Countess Avondale. She had previously married his brother William Douglas 8th Earl Douglas 2nd Earl Avondale; an example of Married to Two Siblings. She the daughter of Archibald Douglas 2nd Duke Touraine and Euphemia Graham Lady Hamilton (age 46). He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale (age 56). They were first cousin once removed.

Around 1459 John Stewart 1st Earl Atholl (age 19) and [his step-daughter] Margaret "Fair Lady of Galloway" Douglas Countess (age 24) were married. She by marriage Countess Atholl. She the daughter of Archibald Douglas 2nd Duke Touraine and Euphemia Graham Lady Hamilton (age 51). He the son of James "Black Knight of Lorn" Stewart and Joan Beaufort Queen Consort Scotland. He a great x 2 grandson of King Edward III of England.

In 1459 [his son-in-law] David Lindsay 1st Duke Montrose (age 19) and [his daughter] Elizabeth Hamilton Duchess Montrose (age 17) were married. She by marriage Countess Crawford. She the daughter of James Hamilton 1st Lord Hamilton (age 44) and Euphemia Graham Lady Hamilton (age 51). He the son of Tiger Earl 4th Earl Crawford and Margaret Dunbar Countess Crawford (age 34). They were half third cousin once removed.

Before 26 Apr 1467 Thomas Boyd 1st Earl Arran and [his future wife] Mary Stewart Countess Arran (age 13) were married. The marriage arranged by his father, Regent Robert Boyd 1st Lord Boyd (age 47). The King, her elder brother [his future brother-in-law] King James III of Scotland (age 15) consider the marriage a great insult. He, Thomas, was subsequently charged with treason and when failing to appear in response to a summons, their marriage was declared null and void, and she was married to James Hamilton 1st Lord Hamilton (age 52). She the daughter of King James II of Scotland and Mary of Guelders Queen Consort Scotland. She a great x 3 granddaughter of King Edward III of England.

Around 1473 William Crichton 3rd Lord Crichton (age 28) and [his future sister-in-law] Princess Margaret Stewart (age 13) were married. She the daughter of King James II of Scotland and Mary of Guelders Queen Consort Scotland. She a great x 3 granddaughter of King Edward III of England.

Before 12 Jul 1474 James Hamilton 1st Lord Hamilton (age 59) and Mary Stewart Countess Arran (age 21) were married. She by marriage Lord Hamilton. The difference in their ages was 38 years. She the daughter of King James II of Scotland and Mary of Guelders Queen Consort Scotland. She a great x 3 granddaughter of King Edward III of England.