John Randolph 3rd Earl of Moray and Euphemia Ross Queen Consort Scotland were married. She by marriage Countess Moray. She the daughter of Hugh 4th Earl Ross and Margaret Graham Countess Ross. He the son of Thomas Randolph 1st Earl of Moray and Isabella Stewart Countess Moray.
In 1306 John Randolph 3rd Earl of Moray was born to Thomas Randolph 1st Earl of Moray [aged 28] and Isabella Stewart Countess Moray.
In 1312 [his father] Thomas Randolph 1st Earl of Moray [aged 34] was created 1st Earl Moray. [his mother] Isabella Stewart Countess Moray by marriage Countess Moray.
On 20th July 1332 [his father] Thomas Randolph 1st Earl of Moray [aged 54] died. His son [his brother] Thomas succeeded 2nd Earl Moray. He would be Earl for twenty days only.
On 12th August 1332 Battle of Dupplin Moor was fought between the supporters of the infant King David II of Scotland [aged 8], son of King Robert the Bruce I of Scotland, and the supporters of King Edward I of Scotland [aged 49], supported by the English. The Bruce army included Robert Bruce Lord of Liddesdale and Domhnall Mar II Earl of Mar [aged 39]. The Balliol army included David III Strathbogie 11th Earl Atholl [aged 23], Ralph Stafford 1st Earl Stafford [aged 30], Thomas Ughtred 1st Baron Ughtred [aged 40] and Walter Manny 1st Baron Manny [aged 22]. The battle is notable for being the first to use dismounted men-at-arms supported by archers; a formation that would bring repeated success to the English both in Scotland and France.
Robert Bruce Lord of Liddesdale was killed leading a charge.
Nicholas Hay [aged 47] was killed.
Thomas Randolph 2nd Earl Moray was killed. His brother John [aged 26] succeeded 3rd Earl Moray.
Domhnall Mar II Earl of Mar was killed.
On 16th December 1332 the Battle of Annan Moor was fought between the supporters of the seven year old King David II of Scotland [aged 8], son of King Robert the Bruce I of Scotland, and the supporters of King Edward I of Scotland [aged 49], supported by the English. The Bruce army, led by, Archibald Douglas [aged 34], supported by John Randolph 3rd Earl of Moray [aged 26] and King Robert II of Scotland [aged 16] surprised King Edward I of Scotland and his supporters at Annan and threw them out of Scotland.
Before 1338 [his brother-in-law] Patrick Dunbar 9th Earl March [aged 52] and [his sister] Agnes "Black Agnes" Randolph Countess March [aged 25] were married. She by marriage Countess Dunbar aka March 1C. The difference in their ages was 27 years. She the daughter of [his father] Thomas Randolph 1st Earl of Moray and [his mother] Isabella Stewart Countess Moray. They were fifth cousins.
On 17th October 1346 at the Battle of Neville's Cross at Neville's Cross, Durham [Map] the English inflicted a heavy defeat on the Scottish army that had invaded England in compliance with their treaty with the French for mutual support against England.
The English army included: William Deincourt 2nd Baron Deincourt [aged 45], Henry Scrope 1st Baron Scrope of Masham [aged 34], Ralph Hastings [aged 55], Ralph Neville 2nd Baron Neville of Raby [aged 55], Archbishop William Zouche, Henry Percy 10th and 2nd Baron Percy [aged 45] and John Mowbray 3rd Baron Mowbray [aged 35].
Of the Scottish army King David II of Scotland [aged 22], John Graham Earl Menteith [aged 56] and William "Flower of Chivalry and Knight Liddesdale" Douglas 1st Earl Atholl [aged 46] were captured and imprisoned in the Tower of London [Map].
Neil Bruce, John Randolph 3rd Earl of Moray [aged 40], David Hay 6th Baron Erroll [aged 28] and Edward Keith of Sinton [aged 66] were killed.

John of Fordun's Chronicle. 165. Battle of Durham fought.
In the month of October 1346 [17th October 1346], David, king of Scotland, gathered his army together, and marched, in great force, into England. On the 17th of October, a battle was fought at Durham, with the English, and King David was defeated and taken prisoner; while all his nobles were taken with him, or killed, except Patrick of Dunbar, Earl of March, and Robert, steward of Scotland, who took to flight, and got away unhurt. Together with the king, were there taken the Earl of Fife; Malcolm Flemyng, Earl of Wigtown; the Earl of Menteith, who was afterwards drawn by horses in England, and was put to death, racked with divers tortures; William of Douglas; and many other barons, nobles, valiant knights, and picked squires. The killed were John of Randolph, Earl of Moray [aged 40]; the Earl of Stratherne; the constable of Scotland; the marshal of Scotland; the chamberlain of Scotland; and numberless other barons, knights, squires, and good men. The same year, just after the aforesaid battle, the castles of Roxburgh and Hermitage (near Castleton) were surrendered to the English; and Lothian was consumed by fire.
In 1374 John Dunbar 1st Earl of Moray [aged 32] was created 4th Earl Moray. Marjorie Stewart Countess Moray [aged 26] by marriage Countess Moray. He was a nephew of the previous Earl of Moray John Randolph 3rd Earl of Moray who was brother of his mother Isabella Randolph.
[his father] Thomas Randolph 1st Earl of Moray and [his mother] Isabella Stewart Countess Moray were married.
Kings Wessex: Great x 8 Grand Son of King Edmund "Ironside" I of England
Kings Scotland: Great x 5 Grand Son of King David I of Scotland
Kings France: Great x 9 Grand Son of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 13 Grand Son of Ranulf I Duke Aquitaine
father: Thomas Randolph 1st Earl of Moray
John Randolph 3rd Earl of Moray 5 x Great Grandson of King David I of Scotland
Great x 4 Grandfather: Walter Fitzalan 1st High Steward
Great x 3 Grandfather: Alan Fitzwalter 2nd High Steward
Great x 2 Grandfather: Walter Stewart 3rd High Steward
Great x 1 Grandfather: Alexander Stewart 4th High Steward
2 x Great Grandson of King David I of Scotland
Great x 3 Grandfather: Gille Críst Angus 4th Earl Angus
Great x 2 Grandmother: Bethóc Angus Great Granddaughter of King David I of Scotland
Great x 4 Grandfather: Henry Dunkeld 3rd Earl Huntingdon 1st Earl of Northumbria
son of King David I of Scotland
Great x 3 Grandmother: Marjorie Dunkeld Countess Angus
Granddaughter of King David I of Scotland
Great x 4 Grandmother: Ada Warenne Countess Huntingdon and Northumbria
3 x Great Granddaughter of Hugh I King of the Franks
Grandfather: John Stewart of Bonkyll
3 x Great Grandson of King David I of Scotland
mother: Isabella Stewart Countess Moray
4 x Great Granddaughter of King David I of Scotland
Great x 1 Grandfather: Alexander de Bonkyl Bonkyl
Grandmother: Margaret Bonkyl