George Douglas, 4th Earl of Angus
George Douglas, 4th Earl of Angus, Lord Douglas, Abernethy and Jedburgh Forest( c. 1427 – 12 March 1463) was a Scottish nobleman.
He was the son of William Douglas, 2nd Earl of Angus and Margaret Hay of Yester.
Known as the Great Earl of Angus, he succeeded to the Earldom following the death of his childless brother James Douglas, 3rd Earl of Angus in 1446.
He was to become the first Red Chief of Douglas.
Donnchadh, Earl of Angus
Donnchadh of Angus, ruled from 1206 until 1214 as Mormaer of Angus.
Little is known about his life, but he seems to have been dead by 1214.
Matilda, Countess of Angus
Matilda of Angus, also known as Maud, was the daughter of Maol Choluim, Earl or Mormaer of Angus and, as his heiress, was countess of the province in her own right.
Margaret Stewart, Countess of Angus
Margaret Stewart, Countess of Angus and Mar (died 1417) was Countess of Angus and Lady of Abernethy in her own right.
Her father was Thomas Stewart, 2nd Earl of Angus.
She was the widow of Thomas, Earl of Mar.
By an illicit affair with William Douglas, 1st Earl of Douglas, husband of the Earl of Mar's sister, she became the mother of George Douglas, 1st Earl of Angus (c. 1380-1403), and secured a charter of her estates for her son, to whom in 1389 the title was granted by King Robert II.
William Douglas, 2nd Earl of Angus
William Douglas, 2nd Earl of Angus (24 February 1398 – October 1437) was a Scottish nobleman and soldier.
The son of George Douglas, 1st Earl of Angus and Princess Mary of Scotland, he was a grandson of King Robert III.
The story of Angus' life is interwoven with that of his uncle and King, James I of Scotland.
Angus was born about 1398 at Tantallon Castle in East Lothian.
He inherited the Earldom of Angus in 1402, following his father's death of the plague whilst in English captivity, following the Battle of Homildon Hill.
Thomas Stewart, 2nd Earl of Angus
Thomas Stewart, 2nd Earl of Angus (b.b.1331-1361) was a medieval Scottish nobleman.
He was the son of John Stewart of Bonkyll and Margaret de Abernethy.
Stewart was an infant when his father died and inherited his estates and titles in Berwickshire, Abernethy and Angus.
In 1353 he married Margaret Sinclair, a daughter of William de St Clair of Rosslyn.
(St Clair was slain in 1330, along with Sir James Douglas, at the Battle of Teba whilst accompanying King Robert's Heart to the Holy Land.)
The petition for this marriage was sent to the Holy See, with support from John II of France, which would suggest that the young Angus spent time at the French court.
Present at the siege of Berwick in 1355, Angus was one of the lords that negotiated the release of David II following his 10-year captivity following the Battle of Neville's Cross.
At some point in the late 1350s, Stewart was made Great Chamberlain of Scotland, an office he lost at some point before 1359, when Walter de Biggar was in office.
Angus was considered one of the conspirators in the murder of King David's mistress, Catherine Mortimer, at Soutra in 1360, and was duly imprisoned.
Whilst being held at Dumbarton Castle, he succumbed to Bubonic plague in 1361.
Archibald Douglas, 6th Earl of Angus
Archibald Douglas, 6th Earl of Angus( c. 148922 January 1557) was a Scottish nobleman active during the reigns of James V and Mary, Queen of Scots.
He was the son of George, Master of Angus, who was killed at the Battle of Flodden, and succeeded as Earl of Angus on the death of his grandfather, Archibald.
Marie Stewart, Countess of Mar
Marie Stewart, Countess of Mar( d. 1644), was a Scottish courtier.
Marie was the daughter of Esmé Stewart, 1st Duke of Lennox, a favourite of James VI of Scotland, and Catherine de Balsac.
Margaret Stewart, Mistress of Ochiltree
Margaret Stewart, Mistress of Ochiltree( d. 1627) was a courtier in the household of Anne of Denmark and looked after her children Prince Henry, Princess Elizabeth, and Charles I of England Margaret was the daughter of Henry Stewart, 1st Lord Methven and Janet Stewart, daughter of John Stewart, 2nd Earl of Atholl and Lady Janet Campbell.
Her three siblings were; Henry Stewart, 2nd Lord Methven( died 3 March 1572), Dorothea Stewart, Countess of Gowrie, and Joan Stewart, Countess of Argyll.
Margaret Stewart was called the" Mistress of Ochiltree" after she married Andrew Stewart, Master of Ochiltree in 1567, eldest son of Andrew Stewart, 2nd Lord Ochiltree and Agnes Cunningham.
After his death in 1578 she married Uchtred Macdowall of Garthland, but was still called, and signed her name," Margaret, Mistress of Ochiltree".
Margaret
Stewart the second wife of the minister John Knox, was her sister in law.
She had a long running dispute with Lord Robert Stewart, commendator of Whithorn over Cruggleton Castle and its lands.
She was friendly with Patrick Vaus of Barnbarroch, and wrote to him in 1583 calling him" brother", and asking him to pay her debt to an Edinburgh tailor, Nicoll Spens.
She called him" brother" as a member of the extended family of Janet Stewart, daughter of the Earl of Atholl, who had married four times, so making Margaret Stewart a relative of the Ruthvens, the Kennedys of Girvanmains, and the Gordons of Sutherland.
On 1 February 1591 she was listed as a member of the household of Anne of Denmark with her daughthers Mary, Martha, and Jean.
Margaret had a male and a female servant and a page.
On 11 October 1603 Margaret Stewart was given a royal pension of 300 and later 700 merks annually for her service to Anne of Denmark and her children from 1590 to 1603, and especially for looking after Lady Margaret, Duke Robert, and Prince Charles before he was put in the keeping of Alexander Seton, 1st Earl of Dunfermline.
Her children formed links at court, especially as ladies in waiting in the household of Anne of Denmark, where she was the senior lady in waiting.
Her second son Josias Stewart sided with the rebel Francis Stewart, 5th Earl of Bothwell, but was pardoned for his treason.
Her children were;
John Comyn (died 1242)
John Comyn, Earl of Angus jure uxoris, was a son of William Comyn, Lord of Badenoch later the Earl of Buchan and became the Earl of Angus, jure uxoris of his wife Matilda, heiress of Máel Coluim, Earl of Angus.
He died in 1242.

Question: Why did Margaret Stewart, Countess Of Angus's father die?
Answer: plague