John Stewart, Earl of Mar (died 1503)
John Stewart, Earl of Mar( December 147911 March 1503) was the youngest son of James III of Scotland and Margaret of Denmark.
Gartnait, Earl of Mar
Gartnait of Mar, Earl of Mar – Gartnait mac Domhnall, 8th Mormaer( or Earl) of Mar, was a Scottish noble during the first War of Scottish Independence( 1296 – 1328).
His name is sometimes rendered as Gartney or Gratney.
A son of Domhnall I, Earl of Mar, and his wife, Elen ferch Llywelyn, Gartnait of Mar died in about 1305.
Mary of Guelders
Mary of Guelders (c. 1434 – 1 December 1463) was the queen consort of Scotland by marriage to King James II of Scotland.
She served as regent of Scotland from 1460 to 1463.
Susan of Mar, Mistress of Mar
Susan Helen of Mar, Mistress of Mar( born 31 May 1963) is the only child and heir presumptive of Margaret of Mar, 31st Countess of Mar.
She married Bruce Alexander Wyllie on 10 June 1989 and has two daughters:
Matthew Stewart, 4th Earl of Lennox
Matthew Stewart, 4th Earl of Lennox( 21 September 15164 September 1571), was the fourth Earl of Lennox, and a leader of the Catholic nobility in Scotland.
He was the son of John Stewart, 3rd Earl of Lennox and Lady Elizabeth Stewart, daughter of John Stewart, 1st Earl of Atholl.
His grandson was King James VI of Scotland and I of England.
John Stewart, Earl of Mar (died 1479)
John Stewart, Earl of Mar and Garioch (c. 1456c.
1479) was the youngest surviving son of James II of Scotland and Mary of Guelders.
After a legal struggle, in 1457 James II obtained from a justiciary court at Aberdeen a recognition of the Crown's right to the earldom and its lands, and bestowed the titles of Earl of Mar and Earl of Garioch on his son sometime between 1458 and 1459.
In 1479, John was accused of treason and imprisoned at Craigmillar Castle.
Shortly thereafter he died in suspicious circumstances, possibly on the orders of his brother James III.
James of Mar, 30th Earl of Mar
James Clifton of Mar, 30th Earl of Mar( 22 November 1914 – 21 April 1975) was a Scottish peer.
He was born James Clifton Lane, and was officially recognized in the style" of Mar" by warrant of the Lord Lyon in 1959 on being recognised as the heir presumptive of Lionel Erskine- Young, 29th Earl of Mar, his first cousin once removed( both he and the 29th Earl were descended from a sister of John Goodeve- Erskine, 27th Earl of Mar), and from then on was known as The Master of Mar, until he succeeded as 30th Earl in 1965.
His only son, David, Master of Mar, Lord Garioch, died in 1967, and when Lord Mar died in 1975 he was succeeded by his elder daughter, Margaret of Mar, Mistress of Mar.
Mairead inghean Eachainn
Mairead inghean Eachainn, also known as Mairead nic Eachainn, was a consort of Alexander Stewart, Earl of Buchan( a man also known as the" Wolf of Badenoch").
She was the daughter of a man named Eachann, and probably the mother of several children, including Alexander's like- named son, Alexander Stewart, Earl of Mar.
Margaret, Countess of Mar
Margaret of Mar( died c. 1391) was Countess of Mar, an ancient earldom in Scotland, in her own right.
She was a daughter of Domhnall II of Mar and after the death of her childless brother Thomas became Countess of Mar.
She had married William Douglas, 1st Earl of Douglas, who was succeeded by their son, James Douglas, 2nd Earl of Douglas and Earl of Mar and Garioch in right of his mother.
But he was killed in 1388, leading the Scots at the Battle of Otterburn.
Margaret was succeeded by her daughter, Isabel, who became Countess of Mar, possessed the Lordship of the Garioch, and also became the Countess of the unentailed lands of the House of Douglas.
Thomas, Earl of Mar
Thomas, Earl of Mar,( c. 1330- 1377) was a 14th- century Earl of Mar, an earldom located in the County of Aberdeen, Scotland.
He is sometimes styled Mormaer of Mar since" mormaer" was the Scottish equivalent of the English word earl.
Because the identification and numbering of the ancient earls of Mar is debatable, Thomas is variously numbered the ninth, tenth, or thirteenth.
of the ancient earls.
He was a son of Domhnall II of Mar, who fell at the Battle of Dupplin Moor in 1332.

Question: When is John Stewart, Earl Of Mar (Died 1479)'s mother's birthday?
Answer: 1434