Earl Douglas is in Earl.
On 26th January 1358 William Douglas 1st Earl Douglas [aged 35] was created 1st Earl Douglas. Margaret Mar Countess Douglas 11th Countess Mar by marriage Countess Douglas.
In 1384 William Douglas 1st Earl Douglas [aged 61] died. His son James [aged 26] succeeded 2nd Earl Douglas.
In 1384 Archibald "Grim" Douglas 3rd Earl Douglas [aged 54] succeeded 3rd Earl Douglas. Joanna Strathearn Countess Douglas by marriage Countess Douglas.
Around December 1400 Archibald "Grim" Douglas 3rd Earl Douglas [aged 70] died at Threave Castle. His son Archibald [aged 28] succeeded 4th Earl Douglas. Margaret Stewart Duchess Touraine by marriage Countess Douglas.
Before 1424 James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale [aged 52] and Beatrice Stewart Countess Douglas and Avondale [aged 62] were married. She by marriage Countess Douglas, Countess Avondale. She the daughter of Robert Stewart 1st Duke Albany and Margaret Graham 3rd Countess Menteith. He the son of Archibald "Grim" Douglas 3rd Earl Douglas and Joanna Strathearn Countess Douglas. They were half third cousin once removed. She a great x 5 granddaughter of King John of England.
In or after 1425 James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale [aged 54] and Beatrix Sinclair Countess Douglas and Avondale [aged 27] were married. She by marriage Countess Douglas, Countess Avondale. The difference in their ages was 27 years. She the daughter of Henry Sinclair 2nd Earl Orkney and Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney [aged 45]. He the son of Archibald "Grim" Douglas 3rd Earl Douglas and Joanna Strathearn Countess Douglas. They were great uncle and niece.
On 24th March 1443 James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale [aged 72] died. His son William [aged 18] succeeded 8th Earl Douglas, 2nd Earl Avondale. Margaret "Fair Lady of Galloway" Douglas Countess [aged 8] by marriage Countess Douglas, Countess Avondale.
On 22nd February 1452 William Douglas 8th Earl Douglas 2nd Earl Avondale [aged 27] was murdered by King James II of Scotland [aged 21] at Edinburgh Castle [Map] for refusing to desist from conspiring with Alexander Lindsay 4th Earl Crawford [aged 29]. His brother James [aged 26] succeeded 9th Earl Douglas, 3rd Earl Avondale.
Before 1455 James Douglas 9th Earl Douglas 3rd Earl Avondale [aged 28] and Margaret "Fair Lady of Galloway" Douglas Countess [aged 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 [aged 46]. He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale [aged 56]. They were first cousin once removed.
After 1463 James Douglas 9th Earl Douglas 3rd Earl Avondale [aged 37] and Anne Holland Countess Douglas and Avondale were married. She by marriage Countess Douglas, Countess Avondale. She the daughter of John Holland 2nd Duke Exeter and Anne Stafford Duchess Exeter. He the son of James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale and Beatrix Sinclair Countess Douglas and Avondale. They were half sixth cousins. She a great x 2 granddaughter of King Edward III of England.
James Douglas 2nd Earl Douglas and Isabella Stewart Countess Douglas were married. She by marriage Countess Douglas. She the daughter of King Robert II of Scotland and Elizabeth Mure Queen Consort Scotland. He the son of William Douglas 1st Earl Douglas and Margaret Mar Countess Douglas 11th Countess Mar. They were half third cousin once removed. She a great x 4 granddaughter of King John of England.