Alexander Stewart, Earl of Buchan, called the Wolf of Badenoch[2] (1343 – July 1394), was a Scottish royal prince, the third son of King Robert II of Scotland by his first wife Elizabeth Mure.

Known in charters as Alexander Senescalli (Latin for Steward), first noted when, on 14 August 1370, he issued letters patent from Ruthven Castle undertaking to grant protection to the Bishop of Moray and all of his lands, men and property in Badenoch.

[6] Alexander's possession of Badenoch was unaffected by the restoration of the Earldom of Moray to John Dunbar in March 1372, nor were the territories of John MacDonald, Lord of the Isles, in Lochaber—similarly with the lands of Urquhart (south of Inverness) which had been granted to David Stewart, Earl of Strathearn and King Robert's eldest son with his second wife, Euphemia.

Other lands belonging to his wife – including Lewis, Skye, Dingwall and Kingedward in Aberdeenshire – he held in joint ownership with her.

[14][16] The Randolph family did not hold the Earldom for long and it reverted to the crown on the death of Thomas's son John, in 1346, and lay vacant for the next 26 years.

[6] To emphasise this, Bur, when he entered into the protection agreement with Alexander in 1370, ensured that the de facto Lord of Badenoch would have no hold on him, nor his lands and people.

Boardman explains that both the bishops of Moray and Aberdeen were in dispute with Alexander regarding the strain that his cateran followers were putting on church lands and tenants.

[18] Boardman also theorises that it was this occupation of church lands, virtually rendering them worthless in terms of income, that may have been the reason for Bur 'voluntarily' giving up his rights to estates such as Rothiemurchas, on 20 April 1382.

[26] Within days, Fife removed Buchan from the Justiciarship and, it is assumed, the Royal Lieutenancy and the Sheriffdom of Inverness and later installed his own son, Murdoch as Justiciar North of the Forth.

[9] Buchan had long deserted his wife and lived with Mairead inghean Eachainn with whom he had several children, including Alexander Stewart, Earl of Mar.

[31] Following the annulment, Buchan lost all claim to Euphemia's lands which returned to her and to her son Alexander Leslie, Earl of Ross who contracted to marry Fife's daughter.

[33] On top of this, Bishop Bur turned to Thomas Dunbar, Sheriff of Inverness and son of the Earl of Moray to provide his protection.

Buchan's brutal assault on Moray in 1390 was to some extent intended to extricate himself from Fife's domination but turned out to be unsuccessful—Alexander was to lose his Lordship of Urquhart in 1392 and then his claim on Ross following his wife's divorce in 1392.

Buchan having acquired vast territories in the north lost a large part of them during his own lifetime (lands of Ross and Urquhart).

Stewart is buried in Dunkeld Cathedral with a handsome and somewhat defaced monument, with the description: His Jacet Domninus Alexander Senescallus, Dominus De Badenoch, Bonæ Memorle, Qui Obit 24 Die Mensis Julii, Anno Domini 1394.